Graham, J.
On June 13, 2003, after an adjudicatory hearing, a hearing officer of the Division of Medical Assistance (Division1) denied the plaintiff, Massachusetts General Hospital (MGH), [486]*486reimbursement for inpatient services it provided to three Medicaid patients. The denial was based on a determination that the provision of inpatient services was not “medically necessary,” as required by the regulations governing Medicaid reimbursement. MGH sought review in the Superior Court pursuant to G. L. c. 30A, § 14(7), and moved for judgment on the pleadings to vacate the Division’s decision. A judge of the Superior Court granted the motion and reversed the Division’s decision on the basis that the Division’s regulations violated MGH’s due process rights because they failed to provide the plaintiff with sufficient “guidance for determining whether a patient admission is appropriate.” The judge also determined that the Division “improperly relied upon hindsight” in making its determinations. The Division appeals from the Superior Court judgment. We reverse and remand for further proceedings consistent with this opinion.
1. Background, a. The patients. The reimbursements at issue were sought by MGH for services provided to three Medicaid patients, whom we call AC, DH, and EQ. In conjunction with making his determination that denial of reimbursement for inpatient services was appropriate, the Division’s hearing officer made the following findings of fact as to these patients.
“Member AC, a 58 year-old female with a history of asthma, atrial fibrillation, hypertension, and status post an atrial septal defect repair, was admitted to the emergency room with low back pain after a fall. . . . [Her] X-rays showed a compression fracture at L2. . . . [She] had no concerning neurological signs, a temperature of 101 degrees, a pulse of 95, a respiratory rate of 24, a blood pressure of 136/82, and an oxygen saturation of 94%. She had mild left lower quadrant tenderness and expiratory wheezes. A chest X-ray was normal, and urinalysis was positive for white blood cells. . . . [She] was treated with oral antibiotics, oral pain medications, and nebulizers. . . . Compression fractures are usually managed in an outpatient setting. . . . Member AC had limited social supports.”
“Member PH, a 61 year-old male, presented to the hospital with a bulge in the left inguinal area. He underwent an elective hernia repair on November 7, 2000 [487]*487in the outpatient setting. . . . [He] emerged from surgery without complications .... [He] was upgraded to the inpatient setting on November 8 and discharged on November 9. He had some nausea and one episode of vomiting following IV hydration. . . . [I]n 1998 [he] also experienced nausea following general anesthesia.... IV fluids, antiemetics and antibiotics are routine following surgery and could have been provided to P.H. in an outpatient setting. ... In Dr. Hopkins’ [MGH’s expert witness’s] opinion, member PH’s vomiting 24 hours after surgery warranted his admission as an inpatient.”
“Member EQ, a 52 year-old male with [a] history of diabetes, presented to the emergency room on February 2, 2002 following a two-day history of vomiting. . . . [He] was admitted on February 2 and discharged on February 6 . . . [His] tests were within normal limits, and there was no concern of intra-abdominal issues. . . [He] was improving each day. In Dr. Siegel’s [the Division’s expert witness’s] opinion, the care provided to [him], while appropriate, could have been provided to him in a specially designated hospital observation bed. . . . Member EQ was a brittle diabetic. In Dr. Hopkinsf] opinion, his condition necessitated active management of his glucose and insulin levels. However, [his] condition did not require active intervention.”
b. The regulations. The Division is responsible for administering the Massachusetts Medicaid program. Medicaid “is a joint Federal and State program established under Title XIX of the Social Security Act designed to provide medical services to those in financial need.” Athol Memorial Hosp. v. Commissioner of the Div. of Med. Assistance, 437 Mass. 417, 418 n.3 (2002). In order to receive Federal funds, the Division is required by Federal law to establish administrative mechanisms to “safeguard against unnecessary utilization of . . . care and services and to assure that payments are consistent with efficiency, economy, and quality of care. . . .” 42 U.S.C. § 1396a(a)(30)(A) (2000).
To comply with this requirement, the Division issued 130 Code Mass. Regs. § 450.204 (2001), which provides that only “medically necessary” services will be reimbursed. A service [488]*488is medically necessary if it is (1) reasonably appropriate to the patient’s medical needs (i.e., medically appropriate) and (2) provided in the appropriate setting (i.e., outpatient or inpatient).2 The Division has also established a utilization management program to conduct reviews of hospital admissions. This program is based on peer review and is designed to ensure that the requirements of 130 Code Mass. Regs. § 450.204 are met.3 See 130 Code Mass. Regs. §§ 450.206, 450.207 (1999).
The Division denied reimbursement for services provided by [489]*489MGH in the three cases currently at issue based on MGH’s failure to show that the services it provided were “medically necessary” within the meaning of 130 Code Mass. Regs. § 450.204. In each case, the Division determined that the services provided to the patients satisfied the first prong of the test, as they were “medically appropriate,” but did not satisfy the second prong of the test because they should have been provided in an outpatient, rather than an inpatient, setting.
MGH appealed from these determinations, arguing that the Division’s regulations governing the utilization management program do not provide sufficient guidance on when inpatient services are appropriate and allow the Division to make arbitrary decisions. The Superior Court judge reversed the Division’s decision based on her determination that the regulations violated due process because they do not provide hospitals with adequate guidance on the appropriate standards applying to inpatient admissions. The judge also determined that the Division’s hearing officer improperly relied on hindsight in making his determination. The Division contests both of these determinations on appeal.4
2. Validity of regulations. On appeal, MGH relies on two legal theories to support its argument that the Division’s regulations are invalid. First, it argues that the regulations are impermissibly vague, in violation of the Fourteenth Amendment to the United States Constitution. Second, it argues that the [490]*490regulations, as administered, are in conflict with the Federal legislative mandate under 42 U.S.C. § 1396a(a)(30)(A).
a. Due process. We begin by reviewing MGH’s due process argument. “A law is void for vagueness if persons ‘of common intelligence must necessarily guess at its meaning and differ as to its application,’ ” Caswell v. Licensing Commn. for Brockton, 387 Mass. 864, 873 (1983), quoting from Connally
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Graham, J.
On June 13, 2003, after an adjudicatory hearing, a hearing officer of the Division of Medical Assistance (Division1) denied the plaintiff, Massachusetts General Hospital (MGH), [486]*486reimbursement for inpatient services it provided to three Medicaid patients. The denial was based on a determination that the provision of inpatient services was not “medically necessary,” as required by the regulations governing Medicaid reimbursement. MGH sought review in the Superior Court pursuant to G. L. c. 30A, § 14(7), and moved for judgment on the pleadings to vacate the Division’s decision. A judge of the Superior Court granted the motion and reversed the Division’s decision on the basis that the Division’s regulations violated MGH’s due process rights because they failed to provide the plaintiff with sufficient “guidance for determining whether a patient admission is appropriate.” The judge also determined that the Division “improperly relied upon hindsight” in making its determinations. The Division appeals from the Superior Court judgment. We reverse and remand for further proceedings consistent with this opinion.
1. Background, a. The patients. The reimbursements at issue were sought by MGH for services provided to three Medicaid patients, whom we call AC, DH, and EQ. In conjunction with making his determination that denial of reimbursement for inpatient services was appropriate, the Division’s hearing officer made the following findings of fact as to these patients.
“Member AC, a 58 year-old female with a history of asthma, atrial fibrillation, hypertension, and status post an atrial septal defect repair, was admitted to the emergency room with low back pain after a fall. . . . [Her] X-rays showed a compression fracture at L2. . . . [She] had no concerning neurological signs, a temperature of 101 degrees, a pulse of 95, a respiratory rate of 24, a blood pressure of 136/82, and an oxygen saturation of 94%. She had mild left lower quadrant tenderness and expiratory wheezes. A chest X-ray was normal, and urinalysis was positive for white blood cells. . . . [She] was treated with oral antibiotics, oral pain medications, and nebulizers. . . . Compression fractures are usually managed in an outpatient setting. . . . Member AC had limited social supports.”
“Member PH, a 61 year-old male, presented to the hospital with a bulge in the left inguinal area. He underwent an elective hernia repair on November 7, 2000 [487]*487in the outpatient setting. . . . [He] emerged from surgery without complications .... [He] was upgraded to the inpatient setting on November 8 and discharged on November 9. He had some nausea and one episode of vomiting following IV hydration. . . . [I]n 1998 [he] also experienced nausea following general anesthesia.... IV fluids, antiemetics and antibiotics are routine following surgery and could have been provided to P.H. in an outpatient setting. ... In Dr. Hopkins’ [MGH’s expert witness’s] opinion, member PH’s vomiting 24 hours after surgery warranted his admission as an inpatient.”
“Member EQ, a 52 year-old male with [a] history of diabetes, presented to the emergency room on February 2, 2002 following a two-day history of vomiting. . . . [He] was admitted on February 2 and discharged on February 6 . . . [His] tests were within normal limits, and there was no concern of intra-abdominal issues. . . [He] was improving each day. In Dr. Siegel’s [the Division’s expert witness’s] opinion, the care provided to [him], while appropriate, could have been provided to him in a specially designated hospital observation bed. . . . Member EQ was a brittle diabetic. In Dr. Hopkinsf] opinion, his condition necessitated active management of his glucose and insulin levels. However, [his] condition did not require active intervention.”
b. The regulations. The Division is responsible for administering the Massachusetts Medicaid program. Medicaid “is a joint Federal and State program established under Title XIX of the Social Security Act designed to provide medical services to those in financial need.” Athol Memorial Hosp. v. Commissioner of the Div. of Med. Assistance, 437 Mass. 417, 418 n.3 (2002). In order to receive Federal funds, the Division is required by Federal law to establish administrative mechanisms to “safeguard against unnecessary utilization of . . . care and services and to assure that payments are consistent with efficiency, economy, and quality of care. . . .” 42 U.S.C. § 1396a(a)(30)(A) (2000).
To comply with this requirement, the Division issued 130 Code Mass. Regs. § 450.204 (2001), which provides that only “medically necessary” services will be reimbursed. A service [488]*488is medically necessary if it is (1) reasonably appropriate to the patient’s medical needs (i.e., medically appropriate) and (2) provided in the appropriate setting (i.e., outpatient or inpatient).2 The Division has also established a utilization management program to conduct reviews of hospital admissions. This program is based on peer review and is designed to ensure that the requirements of 130 Code Mass. Regs. § 450.204 are met.3 See 130 Code Mass. Regs. §§ 450.206, 450.207 (1999).
The Division denied reimbursement for services provided by [489]*489MGH in the three cases currently at issue based on MGH’s failure to show that the services it provided were “medically necessary” within the meaning of 130 Code Mass. Regs. § 450.204. In each case, the Division determined that the services provided to the patients satisfied the first prong of the test, as they were “medically appropriate,” but did not satisfy the second prong of the test because they should have been provided in an outpatient, rather than an inpatient, setting.
MGH appealed from these determinations, arguing that the Division’s regulations governing the utilization management program do not provide sufficient guidance on when inpatient services are appropriate and allow the Division to make arbitrary decisions. The Superior Court judge reversed the Division’s decision based on her determination that the regulations violated due process because they do not provide hospitals with adequate guidance on the appropriate standards applying to inpatient admissions. The judge also determined that the Division’s hearing officer improperly relied on hindsight in making his determination. The Division contests both of these determinations on appeal.4
2. Validity of regulations. On appeal, MGH relies on two legal theories to support its argument that the Division’s regulations are invalid. First, it argues that the regulations are impermissibly vague, in violation of the Fourteenth Amendment to the United States Constitution. Second, it argues that the [490]*490regulations, as administered, are in conflict with the Federal legislative mandate under 42 U.S.C. § 1396a(a)(30)(A).
a. Due process. We begin by reviewing MGH’s due process argument. “A law is void for vagueness if persons ‘of common intelligence must necessarily guess at its meaning and differ as to its application,’ ” Caswell v. Licensing Commn. for Brockton, 387 Mass. 864, 873 (1983), quoting from Connally v. General Constr. Co., 269 U.S. 385, 391 (1926), or if it “subjects people to an unascertainable standard.” Brookline v. Commissioner of the Dept. of Envtl. Quality Engr., 387 Mass. 372, 378 (1982).
Challenges for vagueness are usually raised in the criminal context. See Massachusetts Fedn. of Teachers, AFT, AFL-CIO v. Board of Educ., 436 Mass. 763, 780 (2002). While civil statutes are also subject to scrutiny for vagueness, “[t]he test is less strict when the law involves the regulation of business and economic activity and does not inhibit the exercise of constitutionally protected rights.” Ibid. We also limit our analysis “to whether [the regulations are] unconstitutionally vague as applied in this case,” without considering its constitutionality as applied to other cases. Caswell v. Licensing Commn. for Brock-ton, 387 Mass. at 873.
In addition, we recognize that “the practical necessities of discharging the business of government inevitably limit the specificity with which [a regulatory agency] can spell out prohibitions.” Brookline v. Commissioner of the Dept. Of Envtl. Quality Engr., 387 Mass. at 378, quoting from Boyce Motor Lines, Inc. v. United States, 342 U.S. 337, 340 (1952). We also recognize that the “subject matter and the circumstances” will affect the degree of certainty to which standards can be established. Burnham v. Board of Appeals of Gloucester, 333 Mass. 114, 118 (1955).
The Division’s regulations, as applied to the present case, do not fall below this standard. In addition to defining the term “medically necessary” in 130 Code Mass. Regs. § 450.204, the regulations provide hospitals with several sources of guidance in interpreting this definition. Title 130 Code Mass. Regs. § 415.402 (1999) provides definitions related to inpatient and [491]*491outpatient services.5 Title 130 Code Mass. Regs. § 415.414(C) (2000) provides a list of factors that doctors should consider when deciding whether to admit an individual as an inpatient.6 And the acute inpatient admission guidelines, to which reference is made in 130 C.F.R. § 415.414(C)(7), provide concrete examples of situations in which inpatient hospital admission would generally not be medically necessary.7
[492]*492The guidelines read in conjunction with the regulations do not present an “unascertainable standard,” nor do they require “persons ‘of common intelligence [to] necessarily guess at [their] meaning and differ as to [their] application.’ ” Caswell v. Licensing Commn. for Brockton, 387 Mass. at 873, quoting from Smith v. Goguen, 415 U.S. 566, 572 n.8 (1974). See Brookline v. Commissioner of the Dept. of Envtl. Quality Engr., 387 Mass. at 387. See also Gurry v. Board of Pub. Accountancy, 394 Mass. 118, 126-130 (1985) (finding that regulation disciplining accountants for acts “discreditable to the profession” was not impermissibly vague); Cherubino v. Board of Registration of Chiropractors, 403 Mass. 350, 356-358 (1988) (finding that regulation disciplining chiropractor for “[o]verutilization of practice” was not impermissibly vague).
b. Compliance with Federal mandate. We now address the plaintiff’s claim that the Division’s regulations were inconsistent with the Federal legislative mandate. When reviewing the [493]*493Division’s regulations “we must apply all rational presumptions in favor of the validity of the administrative action and not declare it void unless its provisions cannot by any reasonable construction be interpreted in harmony with the legislative mandate.” Consolidated Cigar Corp. v. Department of Pub. Health, 372 Mass. 844, 855 (1977). However, “a regulation that is irreconcilable with an agency’s enabling legislation cannot stand.” Quincy v. Massachusetts Water Resources Authy., 421 Mass. 463, 468 (1995).
In determining “whether the agency conformed with the controlling statute[,] .... [w]e are limited to a determination whether the State action is arbitrary, capricious, or contrary to law.” Massachusetts Hosp. Assn. v. Department of Pub. Welfare, 419 Mass. 644, 652 (1995). See Tarin v. Commissioner of the Div. of Med. Assistance, 424 Mass. 743, 750 (1997). “[A] court cannot ‘substitute [its] judgment as to the need for a regulation, or the propriety of the means chosen to implement the statutory goals, for that of the agency, so long as the regulation is rationally related to those goals.’ ” Massachusetts Fedn. of Teachers, AFT, AFL-CIO v. Board of Educ., 436 Mass. 763, 772 (2002), quoting from American Family Life Assur. Co. v. Commissioner of Ins., 388 Mass. 468, 477, cert. denied, 464 U.S. 850 (1983).
Both the plaintiff and the judge below rely on the Supreme Judicial Court’s holding in Massachusetts Eye & Ear Infirmary v. Commissioner of the Div. of Med. Assistance, 428 Mass. 805 (1999) (Mass. Eye & Ear), to support their position that the Division’s regulations are “so lacking in standards as to be arbitrary.” Id. at 814. In Mass. Eye & Ear, the court held that a prior version of the presently disputed regulations did not “comport with the mandate of the Federal statute” that they implemented. Id. at 817.
The court in Mass. Eye & Ear identified three areas where the regulatory regime fell short: (1) the regulations “fail[ed] to define ‘[m]edical [necessity’ in any meaningful manner,” id. at 813; (2) the review process improperly relied on hindsight in determining the appropriateness of a doctor’s decision to admit, rather than “tak[ing] into account the physician-assessed risk to the particular patient at the time of admission,” id. at 814-815; [494]*494and (3) the Division imposed a “severe all-or-nothing penalty on providers who render appropriate treatment in the ‘wrong’ setting,” id. at 816.8 The Court then gave two alternatives for remedying the problem:
“The division may operate on a case-by-case basis to determine the appropriate level of care, defined in some meaningful way, and allow reimbursement at that level, provided there is adequate review of its decision. Or it may promulgate clear rules and deny all reimbursement to providers who seek reimbursement at levels not in compliance with those rules.”
Id. at 817. A thorough review of the Division’s regulations, considered in conjunction with the inpatient guidelines, note 7, supra, convinces us that the current regulations comply with the requirements set out by Mass. Eye & Ear.
As discussed, for purposes of authorizing reimbursement for inpatient services, the regulations essentially define “medical necessity” as a medically appropriate service that cannot effectively be provided in a less costly outpatient setting. In view of the specificity provided by the appropriate factors and the guidelines (see notes 5-7, supra), we conclude that the regulations sufficiently define “medical necessity” to allow providers to determine in what circumstances an inpatient admission is appropriate. In particular, we point to the inclusion of “Observation Services” as defined in 130 Code Mass. Regs. § 415.402 (see note 5, supra), and the evident thrust of the regulatory scheme favoring what might best be termed an intermediate level of care, “outpatient hospital services provided ... in an acute inpatient hospital,” affording a closer clinical observation and monitoring of patients who may need it without the need (or cost) of an inpatient admission, before resort to inpatient services. See guidelines at note 7, supra. This thread runs throughout the regulations and guidelines, which strike a balance between the need for medically appropriate care and the use of the least expensive setting to provide that care.
[495]*495The plaintiff next asserts, and the judge concluded, that the review process improperly relies upon hindsight. This is facially incorrect. “Reviewers consider the medical-record documentation of clinical information available to the admitting provider at the time the decision to admit was made. Reviewers do not deny admissions based on what happened to the member after the admission.” 130 Code Mass. Regs. § 415.414(B)(1) (2000).9
Unlike in Mass. Eye & Ear, the Division has “compl[ied] with the Federal statutory mandate to provide utilization review that ‘assure[s] that payments are consistent with efficiency, economy, and quality of care.’ ” Mass. Eye & Ear, supra at 814, quoting from 42 U.S.C. § 1396a(a)(30)(A). The regulatory scheme is sufficient to meet the requirements set forth in Mass. Eye & Ear, and is not “arbitrary, capricious, or contrary to law” as the plaintiff suggests. Massachusetts Hosp. Assn. v. Department of Pub. Welfare, 419 Mass. at 652.
3. Substantial evidence. MGH asserted below that the Division’s decision to deny reimbursement in each of the three cases was not supported by substantial evidence. In light of her decision on constitutional grounds, the Superior Court judge did not reach the issue. Neither party addresses the issue before us,10 which we do not reach in the first instance on appeal. We remand this matter to the Superior Court for a determination whether there is substantial evidence to support the Division’s decision in these cases.
The judgment is reversed, and the case is remanded to the [496]*496Superior Court for further proceedings consistent with this opinion.
So ordered.