TL;DR: The Centers for Medicare & Medicaid Services modified NCD 140, governing coverage of services and supplies incident to a physician's services when that physician maintains an office within a nursing home or other institution, effective March 7, 2026. Here's what billing teams need to know.
This update tightens how Medicare Administrative Contractors evaluate incident-to billing for physician offices located inside institutional settings. NCD 140 in the CMS Medicare system does not list specific CPT or HCPCS codes — coverage determinations apply to the incident-to framework broadly. The rules here affect any practice where a physician sees patients inside a nursing facility, long-term care setting, or similar institution and bills under the incident-to provision.
Quick-Reference Table
| Field | Detail |
|---|---|
| Payer | CMS (Centers for Medicare & Medicaid Services) |
| 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, family medicine, any specialty with physician offices in nursing homes, long-term care, or institutional settings |
| Key Action | Audit all incident-to claims billed from physician offices within institutions — verify staff employment status, supervision documentation, and physical office separation before the March 7, 2026 effective date |
CMS Incident-to Physician Services Coverage Criteria and Medical Necessity Requirements 2026
The CMS incident-to physician services coverage policy under NCD 140 has always been strict. This modification makes clear that the rules apply with full force — and close scrutiny — when a physician's office sits inside an institution.
To bill incident-to services from an institutional office, four conditions must all be true. Get any one of them wrong, and you're looking at a claim denial.
First, the office must be physically distinct. CMS is explicit: the physician's office "must be confined to a separately identified part of the facility which is used solely as the physician's office." It cannot extend throughout the institution. If your physician sees patients in multiple rooms or common areas of the nursing home, those services are not covered under the incident-to framework. Only services performed within the defined office space qualify.
Second, staff must be employed by the physician's office — not the institution. This is the rule most billing teams miss. Auxiliary medical personnel must be members of the physician's office staff, not employees of the nursing home or institution. If a nursing home CNA or nurse assists during a visit and that person is on the institution's payroll, the incident-to coverage policy does not apply. Document employment status clearly and keep it on file.
Third, supply costs must be an expense of the physician's practice. The cost of supplies used during the visit must come from the physician's practice budget, not the facility's. If the institution is absorbing supply costs, those supplies are not covered under incident-to billing guidelines. This matters especially when a physician is also the owner or administrator of the facility — CMS calls that relationship out specifically and says MAC reviewers should draw a clear line between the office practice and the institution.
Fourth, supervision must be direct and in the room — not just in the building. Services performed by the physician's employees outside the defined office area require direct physician supervision. The policy is unambiguous: "his presence in the facility as a whole would not suffice to meet this requirement." Being somewhere in the building is not enough. The physician must be physically present in the office area when auxiliary staff perform services.
Beyond these four conditions, CMS adds a medical necessity overlay. When a physician maintains an office inside an institution, the MAC will scrutinize claims more closely. The concern is volume: a physician with an in-house office can see a large number of patients quickly, or visit the same patient repeatedly. CMS signals that MACs should evaluate whether each service was reasonable and necessary — not just whether the paperwork clears.
Whether a service meets medical necessity under this coverage policy depends on the Medicare Benefit Policy Manual, Chapter 6 (§20.4.1) and Chapter 15 (§60.1). If your MAC issues a local coverage determination that layers on top of NCD 140, that LCD takes precedence for your region. Check with your Medicare Administrative Contractor for any regional guidance that may apply to your specific setting.
CMS Incident-to Billing Exclusions and Non-Covered Indications
NCD 140 draws clear lines around what the incident-to framework does not cover. These are not edge cases — they come up regularly in audits.
Services "not commonly furnished" in physician offices are excluded. Even if a physician performs a service in his institutional office that he wouldn't normally perform in a standalone office, reimbursement is denied. The test is what's commonly furnished in physician offices generally — not what's possible in this specific location. Equipment-intensive procedures or services that belong in a facility setting fail this test.
Services outside the defined office area are not covered under incident-to rules. Once the physician or their staff steps outside the designated office space into the broader institution, different coverage rules apply. Those services are subject to the rules for services furnished outside the office setting. You may still be able to bill them — but not as incident-to services from the physician's office.
Supervision alone does not qualify as a professional service. CMS explicitly states that "supervision of auxiliary personnel in and of itself is not considered a physician's professional service." To support incident-to billing, the physician must perform or have previously performed a personal professional service to the patient. The auxiliary staff's services must be incidental to that personal service. A physician who only supervises — without a documented personal service to that patient — cannot anchor an incident-to claim.
Denials for failing these requirements are based on §1861(s)(2)(A) of the Social Security Act. When your MAC denies a claim under NCD 140, that's the statutory authority they'll cite. Know it. When you appeal, your rebuttal needs to address that section directly.
Coverage Indications at a Glance
| Indication | Status | Relevant Codes | Notes |
|---|---|---|---|
| Services performed in a separately identified physician office within an institution, by office staff, using office-purchased supplies, with direct physician supervision | Covered | No specific CPT/HCPCS listed — applies to incident-to framework broadly | All four conditions must be met simultaneously |
| Services performed by institutional staff (not physician's office employees) | Not Covered | N/A | Fails the auxiliary staff employment test under §1861(s)(2)(A) |
| Services performed outside the designated physician office area | Not Covered | N/A | Subject to non-office coverage rules; incident-to framework does not apply |
| Services using supplies paid for by the institution, not the physician's practice | Not Covered | N/A | Supply cost must be an expense of the physician's office practice |
| Services not commonly furnished in physician offices generally | Not Covered | N/A | Location of performance does not expand the scope of covered services |
| Services where physician is present in the facility but not in the office area during auxiliary staff performance | Not Covered | N/A | General facility presence does not satisfy direct supervision requirement |
| High-volume or high-frequency claims from in-institution offices | Subject to Enhanced MAC Review | N/A | MAC will evaluate medical necessity on each claim individually |
| Claims where physician is also administrator or owner of the institution | Subject to Enhanced MAC Review | N/A | CMS specifically flags this for closer scrutiny of practice vs. facility separation |
CMS Incident-to Physician Services Billing Guidelines and Action Items 2026
This policy change carries real financial exposure. In-institution physician office billing touches nursing home visits, long-term care practices, and any specialty that co-locates with a facility. Here's what to do before the March 7, 2026 effective date.
| # | Action Item |
|---|---|
| 1 | Audit your physician office locations. Pull a list of every physician in your group who maintains an office inside a nursing home, long-term care facility, or similar institution. For each, confirm that the office is a separately identified, dedicated space. If the physician uses multiple rooms or common areas, those claims do not qualify under NCD 140 incident-to billing guidelines. |
| 2 | Verify staff employment on every in-institution claim. Check that all auxiliary staff billing incident-to services from institutional offices are employed by the physician's practice — not the facility. Get written confirmation of employment status. If any staff members are dual-employed or facility employees, exclude their services from incident-to claims immediately. |
| 3 | Document supply costs as physician practice expenses. Review your accounts payable for supplies used in institutional offices. Supplies must be an expense of the physician's practice. If the facility is providing supplies at no charge to the practice, you have a coverage problem. Fix the billing arrangement before the March 7, 2026 effective date or stop billing those services as incident-to. |
| 4 | Strengthen your supervision documentation. Your notes must show that the physician was physically present in the office area — not just in the building — when auxiliary staff performed services. Update your documentation templates to capture this specifically. "Physician on premises" is not enough. "Physician present in office suite during procedure" is what you need. |
| 5 | Flag physician-owner and physician-administrator arrangements for compliance review. If any physician in your group is also the owner or administrator of the institution where they maintain an office, pull those claims for a separate review. CMS tells MACs to look hard at these arrangements. Your compliance officer should review incident-to billing guidelines for these cases before the effective date of March 7, 2026. |
| 6 | Brief your coders on the office-vs.-institution line. Any service performed outside the defined physician office area must be coded and billed under the rules applicable to non-office settings. Train your coding team to ask, "Was this service performed in the designated office space?" before applying incident-to rules. A single misclassification on a high-volume nursing home practice can turn into a significant overpayment liability. |
| 7 | Check with your MAC for regional LCDs. NCD 140 is a national coverage determination, but your Medicare Administrative Contractor may have issued additional local guidance. Contact your MAC or check their website for any LCD that addresses incident-to billing in institutional settings. Regional rules can be stricter than the national policy. |
If you run a large nursing home-based practice or manage billing for a physician group with multiple institutional office locations, loop in your compliance officer before March 7, 2026. The combination of enhanced MAC scrutiny and the physician-owner carve-out creates real audit risk.
| 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 Services Under NCD 140
Covered CPT and HCPCS Codes
The policy data for NCD 140 does not list specific CPT or HCPCS codes. This coverage policy governs the incident-to framework itself — the rules that determine whether any service billed under the incident-to provision qualifies for Medicare reimbursement. Coverage applicability depends on whether the service, the staff, the space, and the supplies all meet the criteria above.
For specific code-level guidance on what's billable as incident-to, refer to your MAC's billing guidelines and the Medicare Benefit Policy Manual, Chapter 6 (§20.4.1) and Chapter 15 (§60.1).
Key ICD-10-CM Diagnosis Codes
No ICD-10-CM codes are specified in the NCD 140 policy data. Medical necessity for individual services is evaluated at the claim level by the MAC, not by diagnosis-specific coverage criteria under this NCD.
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