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Medical Necessity Guidelines — Inpatient Surgical Care
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Criteria and prior authorization requirements Mass General Brigham Health Plan uses to determine medical necessity for elective inpatient surgical care across plan types, including Medicare Advantage, ACO, One Care/SCO, and Commercial/Qualified Health Plans.
No material clinical or coverage changes in this revision.
Inpatient Surgical Care — Authorization Criteria
Commercial inpatient authorization criteria
Inpatient hospital care is authorized when the elective surgical procedure is authorized (or does not require prior authorization), AND one of the following is met:
Commercial inpatient authorization options
- Option 1: The surgical procedure requested is listed on the InterQual® Procedures Setting by CPT® Code Report as an inpatient setting procedure.
Option 2
- 2a: The member takes warfarin.
- 2b: Low molecular weight heparin (LMWH) is contraindicated in the postoperative setting.
2c: High VTE risk conditions (one of)
- 2c.i: Mechanical heart valve with at least one of the following: major stroke risk factor (e.g., atrial fibrillation, prior stroke/TIA, prior valve thrombosis, rheumatic heart disease, hypertension, diabetes, congestive heart failure, age ≥75 years); OR caged ball or tilting-disc valve in the mitral or aortic position; OR recent stroke or TIA within the last 3 months.
- 2c.ii: Atrial fibrillation with CHA2DS2VASc score of 7 or greater.
- 2c.iii: Atrial fibrillation with CHADS2 score of 5 or greater, or recent stroke/TIA (as specified in policy).
- 2c.iv: Rheumatic valvular disease.
- 2c.v: VTE within 3 months.
- 2c.vi: Severe thrombophilia.
- 2c.vii: Antiphospholipid antibodies.
- 2c.viii: Active high-risk cancer.
- Option 3: Clinical documentation indicates the member is expected to require at least two postoperative nights in the hospital.
- Option 4: Member has ASA Physical Status Classification System class III or IV as defined in policy.
See InterQual General Surgical, General Trauma, or other applicable subsets.
Authorization for inpatient hospital care in this policy is conditional: the elective surgical procedure itself must be authorized (or not require prior authorization), and one of the listed inpatient criteria for the member’s product must be met. For Commercial plans that means the procedure must be listed as inpatient by InterQual, meet specified postoperative anticoagulation/high‑VTE‑risk criteria, document an expected need for at least two postoperative nights, or meet the ASA class requirement. For Medicare Advantage members the CMS framework applies (including the Two‑Midnight Rule) and inpatient authorization may be granted only when the procedure is on the CMS Inpatient Only List, when commercial criteria are met, or when documentation supports care spanning at least two midnights.
The policy does not provide a separate list of explicit “not medically necessary” example scenarios. Practically, inpatient care is not authorized when none of the applicable authorization criteria are satisfied for the member’s product — for example, if the procedure is not on the CMS Inpatient Only List (Medicare Advantage) or not listed by InterQual (Commercial), there is no documentation supporting a two‑midnight stay, and anticoagulation/high‑risk criteria (when claimed) are not met.
Key Coding & Clinical Thresholds
Prior Authorization, Documentation & Denial Triggers
Medicare Advantage prior authorization and Two‑Midnight/CMS IO list rules
Prior authorization is required for Medicare Advantage members. Mass General Brigham Health Plan follows CMS guidance (NCDs, LCDs, LCAs and Medicare manuals) and uses the CMS Two-Midnight Rule to determine medical necessity for inpatient hospital care. Pre-service inpatient authorization may be granted when the elective surgical procedure is authorized (or does not require prior authorization) AND one of: (1) the procedure is on the CMS Inpatient Only List; (2) commercial criteria are met; or (3) documentation shows the member will require medically necessary hospital care spanning at least two midnights (secondary review required).
- CMS guidance (NCDs/LCDs/LCAs/Medicare manuals) is the basis for Medicare Advantage determinations.
- Uses CMS Two-Midnight Rule to determine inpatient medical necessity.
- Three authorization pathways: CMS Inpatient Only List; Mass General Brigham commercial criteria; or documented expectation of ≥ two midnights (requires secondary review).
Mass General Brigham ACO prior authorization — apply MassHealth then commercial criteria
Prior authorization is required for Mass General Brigham ACO members. The plan uses MassHealth guidance for medical necessity determinations when available; when MassHealth provides no guidance for inpatient surgical care, Mass General Brigham Health Plan's commercial criteria are applied.
- MassHealth guidance is primary for ACO determinations when available.
- If MassHealth has no guidance for the requested service (as for inpatient surgical care), apply Mass General Brigham commercial criteria.
One Care / SCO prior authorization — use CMS first, then MassHealth
Prior authorization is required for One Care and SCO members. The plan uses CMS guidance (NCDs/LCDs/LCAs and Medicare manuals) first; when CMS guidance is absent or the member does not meet CMS criteria, MassHealth medical necessity guidelines are applied.
- CMS guidance is the basis for One Care/SCO determinations.
- If no CMS guidance exists, or CMS criteria are not met, use MassHealth guidelines.
Commercial prior authorization required for elective inpatient surgery
Prior authorization is required for Commercial and Qualified Health Plan members for elective inpatient surgical procedures. Inpatient care is authorized when the elective procedure is authorized (or does not require prior authorization) and one of the commercial criteria is met (see policy for detailed options).
- Commercial pre-service authorization uses InterQual Procedures Setting by CPT Code Report for inpatient designation.
- Other authorization options include specified postoperative unfractionated heparin bridge criteria, documented expectation of ≥ two postoperative nights, or ASA class III/IV per policy definitions.
Plan‑specific prior authorization pathways and application
Providers must follow the same plan-specific prior authorization processes and submit requests per the member's plan type; see the policy for criteria-specific pathways (CMS Inpatient Only List, InterQual inpatient listing, anticoagulation/high‑VTE risk criteria, two‑night expectation, or ASA class guidance).
- Use CMS guidance and Two‑Midnight Rule for Medicare Advantage/One Care/SCO when applicable.
- Use InterQual inpatient setting designation and commercial criteria for Commercial/ACO when MassHealth/CMS guidance is not controlling.
Required supporting documentation to justify inpatient authorization
Clinical documentation must demonstrate that the elective surgical procedure is authorized (or does not require prior authorization) and must provide evidence meeting the applicable authorization criteria (e.g., CMS Inpatient Only listing, InterQual inpatient designation, medical justification for a two‑midnight stay, or details supporting anticoagulation/high‑VTE risk).
- Evidence that the procedure is on the CMS Inpatient Only List or the InterQual Procedures Setting by CPT Code Report.
- Clinical justification for expected medically necessary care spanning at least two midnights when claimed.
- Documentation of anticoagulation needs: warfarin use, contraindication to LMWH postoperatively, and the specified high‑VTE risk conditions.
Medicare Advantage inpatient denial triggers (CMS IO list / Two‑Midnight)
For Medicare Advantage members, inpatient authorization may be denied if none of the Medicare pathways are met — i.e., the procedure is not on the CMS Inpatient Only List, Mass General Brigham commercial criteria are not met, and clinical documentation does not support medically necessary care spanning at least two midnights.
- Failure to identify the procedure on the CMS Inpatient Only List.
- Failure to meet Mass General Brigham commercial inpatient criteria when relied upon.
- Insufficient documentation that the member will require care spanning at least two midnights (secondary review requirement unmet).
Commercial inpatient denial triggers (InterQual, anticoagulation, two‑night, ASA)
For Commercial members, inpatient authorization may be denied if the elective procedure is not listed as inpatient by InterQual, the postoperative anticoagulation/high‑VTE criteria are not satisfied, the patient is not expected to require at least two postoperative nights, or the required ASA physical status classification is not met.
- Procedure not listed on InterQual Procedures Setting by CPT Code Report as inpatient.
- Postoperative unfractionated heparin bridge criteria not fully met (warfarin use, LMWH contraindication, and specified high‑VTE risk condition).
- Clinical documentation does not support expectation of at least two postoperative nights.
- ASA Physical Status Classification is not III or IV when required by the authorization pathway.
Policy Background
This policy defines medical necessity criteria and prior authorization requirements for prospective elective inpatient surgical care when InterQual subsets do not apply or when pre‑service review is requested. It aligns Medicare Advantage decisions with CMS guidance (including use of the Two‑Midnight Rule) and applies InterQual‑based criteria for Commercial plans. The policy also specifies clinical situations that justify inpatient stays — for example, documented need for at least two postoperative nights, postoperative unfractionated heparin bridging in patients with high thromboembolic risk, or ASA Physical Status class III/IV when required — and sets different authorization pathways by product type.
Key Clinical Definitions
Policy Revision History
Policy effective date set to 2026-08-01 for Inpatient Surgical Care (Policy 116).
ASA III definition clarifications included (examples: COPD, morbid obesity BMI ≥40, ESRD on dialysis, history >3 months of MI/CVA/TIA/PE, severe OSA, etc.).
ASA IV definition clarifications included (examples: recent <3 months MI/CVA/TIA, severe reduction of ejection fraction or CHF NYHA class 4, shock, sepsis, ESRD not on scheduled dialysis, etc.).
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