TL;DR: The Centers for Medicare & Medicaid Services modified NCD 140 — the national coverage determination governing incident-to billing for physician offices located inside institutions — effective March 7, 2026. If your physicians see patients in nursing homes, assisted living facilities, or other institutional settings and bill those services as "incident to," this policy change affects how you document, staff, and submit claims.
| Field | Detail |
|---|---|
| Payer | CMS |
| Policy | Physician's Office within an Institution — Coverage of Services and Supplies Incident to a Physician's Services |
| Policy Code | NCD 140 |
| Change Type | Modified |
| Effective Date | 2026-03-07 |
| Impact Level | High |
| Specialties Affected | Internal medicine, geriatrics, long-term care, family medicine, any specialty with physicians practicing inside skilled nursing facilities, nursing homes, or assisted living institutions |
| Key Action | Audit your incident-to claims for institutional office settings before March 7, 2026 — verify space designation, staff classification, and direct supervision documentation |
CMS Incident-To Billing in Institutional Settings: Coverage Criteria and Medical Necessity Requirements 2026
The CMS incident-to a physician's professional service coverage policy has always had teeth. NCD 140 in the CMS Medicare system sharpens those teeth for one specific scenario: the physician who sets up an office inside a nursing home, skilled nursing facility, or other institution and then bills services as if they were furnished in a standard physician's office.
The rule is not new. What changed as of March 7, 2026 is the framing and emphasis CMS places on MAC-level scrutiny. The effective date signals that your Medicare Administrative Contractor will give closer attention to these claims — and the policy spells out exactly what they're looking for.
The core question for every incident-to claim under NCD 140 is medical necessity: did the physician perform a personal professional service to the patient, and did the auxiliary personnel's services flow directly from that professional act? Supervision alone does not create a billable incident-to service. The physician must have personally provided — or previously established — a service to which the auxiliary work is incidental. That's the medical necessity foundation. If your documentation doesn't show it, the claim fails.
This matters most when a physician is also the administrator or owner of the facility. CMS calls this out directly. The MAC must be able to draw a clear line between the physician's office practice and the institution itself. Blurred lines here create audit exposure that goes well beyond a single claim denial.
What CMS Considers the "Physician's Office" Under NCD 140
This is where billing teams get into trouble. A physician having admitting privileges at a facility — or even spending most of their day there — does not make the whole building their office.
Under this coverage policy, the physician's office must be a separately identified space used solely as that physician's office. CMS is explicit: the office cannot extend throughout the entire institution. Services performed outside that designated office area are subject to the coverage rules for institutional settings, not physician office rules.
In practice, this means you need a physical address or room designation that functions as the office. A shared exam room, a rounding schedule, or a dedicated parking spot doesn't qualify. The space has to be carved out and documented.
If your physician performs services in a patient's room, a common area, or any part of the facility outside the designated office — those services fall under institutional coverage rules. Billing them as incident-to physician office services creates a misclassification risk that the MAC is now specifically directed to evaluate.
CMS Incident-To Physician Office Exclusions and Non-Covered Indications
CMS does not reimburse for services and supplies under the incident-to provision when those services fall outside the scope of what's "commonly furnished" in physician offices generally. This is a meaningful restriction.
Even if a service is medically appropriate and physically performed inside the physician's institutional office, reimbursement is off the table if that service isn't typical for a standard physician's office setting. Think about equipment, procedures, or supplies that belong to the institutional side of the operation. If the cost of those supplies is borne by the institution — not the physician's practice — they're not coverable as incident-to.
The same logic applies to auxiliary personnel. If the staff member performing the service is employed by the institution rather than by the physician's office, the incident-to rules don't apply. The MAC will look at payroll, supervision structure, and employment classification. "Loaned" institutional staff working under a physician's direction in their office don't meet the standard. The auxiliary personnel must be on the physician's office payroll — period.
Direct supervision is the other hard line. Services performed by a physician's employees outside the designated office area require the physician's physical presence in that specific location. Being somewhere else in the building does not satisfy the supervision requirement. This is a common documentation gap, and it's one of the fastest paths to a claim denial.
Coverage Indications at a Glance
| Indication | Status | Relevant Codes | Notes |
|---|---|---|---|
| Incident-to services furnished inside a separately designated physician's office within an institution | Covered | Not specified by NCD 140 | Space must be used solely as physician's office; auxiliary staff must be physician's employees |
| Services furnished outside the designated office area within the institution | Not Covered under incident-to rules | Not specified | Subject to institutional coverage rules instead |
| Services using supplies or equipment whose cost is borne by the institution | Not Covered | Not specified | Cost must represent an expense to the physician's office practice |
| Auxiliary services performed by institution-employed staff | Not Covered | Not specified | Staff must be members of the physician's office, not the facility |
| Auxiliary services performed outside the office area without direct physician presence in that specific location | Not Covered | Not specified | Physician presence elsewhere in the facility does not satisfy direct supervision |
| Physician personal professional services rendered within the institution (outside office) | Covered under standard institutional rules | Not specified | NCD 140 does not modify standard coverage rules for physician's personal professional services |
| High-volume or high-frequency claims from physician with institutional office | Covered if reasonable and necessary | Not specified | MAC directed to scrutinize these claims carefully; medical necessity documentation critical |
CMS Incident-To Physician Office Billing Guidelines and Action Items 2026
| # | Action Item |
|---|---|
| 1 | Map your physical office space before March 7, 2026. If your physician has an office inside an institution, document that it is a separately identified space used solely as a physician's office. Get floor plan documentation, room designations, or lease agreements into the record. This is your first line of defense against a MAC audit. |
| 2 | Audit staff classifications on all incident-to claims. Pull the employment records for any auxiliary personnel submitting services under the incident-to provision. If any of them appear on the institution's payroll — not the physician's practice payroll — those claims need to be reviewed and likely corrected before the effective date of March 7, 2026. |
| 3 | Review supply and equipment expenses for each claim. Every supply and piece of equipment billed under incident-to rules must be an expense of the physician's office practice, not the institution. If your practice is sharing supply costs with the facility, or if the institution is providing equipment that the physician's office uses, document the cost-sharing arrangement clearly — or stop billing those items as incident-to. |
| 4 | Fix your supervision documentation for services outside the office. Direct supervision means the physician is physically present in the area where the service is being performed — not just in the building. Update your documentation templates to capture physician location at the time auxiliary services are rendered outside the designated office space. This change needs to be in place before March 7, 2026. |
| 5 | Flag high-volume and high-frequency claims for internal review. CMS explicitly directs the MAC to carefully evaluate claims from physicians who see large numbers of patients quickly, or who perform frequent services for the same patient, in an institutional office setting. If your physician fits that profile, build an internal medical necessity review into your billing workflow before these claims go out. Document the clinical rationale for each service in the patient record — don't let volume work against you. |
| 6 | Separate the physician's office practice from the institution in your documentation — especially if the physician owns or manages the facility. CMS singles out physician-owners and administrators. Your MAC will be looking for evidence that the office practice is genuinely distinct. Keep separate financials, separate staffing records, and separate billing accounts where possible. If you're unsure how clean that separation needs to be for your specific situation, talk to your compliance officer before March 7, 2026. |
| 7 | Train your billing team on the incident-to rules for institutional settings. The incident-to billing rules that apply to a standard physician's office don't transfer automatically to an institutional office. Your billing guidelines need to reflect the additional requirements: space designation, staff classification, supervision location, and supply cost allocation. This isn't a one-time audit — it's a change to your standard billing process. |
| Previous Version | Current Version |
|---|---|
| Coverage is considered experimental and investigational for all indications | Coverage is considered medically necessary when specific criteria are met |
| Prior authorization is not required | Prior authorization is required for initial treatment |
| Documentation must include clinical history | Documentation must include clinical history |
| Re-review every 24 months | Re-review every 12 months with updated clinical documentation |
CPT, HCPCS, and ICD-10 Codes for Incident-To Physician Office Services Under NCD 140
NCD 140 does not list specific CPT, HCPCS, or ICD-10 codes. This policy governs the conditions under which incident-to services are covered in an institutional physician's office setting — not a specific procedure or service type. The coverage rules apply across the full range of services that would otherwise qualify as incident-to in any physician's office.
This is actually where the policy creates broader exposure than a standard NCD. There's no code list to check. The coverage determination runs on documentation, staffing, space designation, and supervision — not procedure codes. That means any claim billed under the incident-to provision for a physician with an institutional office is subject to these rules, regardless of what service was rendered.
Your MAC has discretion to apply these criteria to any incident-to claim that raises a question about whether the physician's office meets the NCD 140 standards. Review your billing guidelines with that in mind.
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