National Correct Coding Initiative (NCCI) edits for occupational therapy

National Correct Coding Initiative (NCCI) edits are a set of coding policies and automated claim‑processing rules developed by the Centers for Medicare & Medicaid Services (CMS) to promote accurate reporting of healthcare services and prevent improper payment. Under the NCCI program, edits evaluate CPT® and HCPCS codes billed by the same provider for the same patient on the same date of service. Procedure-to-Procedure (PTP edits) identify code combinations that typically should not be reported together. Medically Unlikely edits (MUEs) limit the number of units of an individual code that can be billed per day. NCCI edits are applied across Medicare, state Medicaid programs, and many private insurers* to ensure consistent, compliant billing.

For occupational therapy practitioners (OTPs), NCCI edits directly affect how therapy services are reimbursed. They determine when different therapy procedure codes can be billed together, when separate services are considered components of a more comprehensive intervention (and therefore bundled under a single code), and when a modifier may be required to indicate that two services are distinct and separately reportable on the same day.

National NCCI Edit tables are updated quarterly and may be downloaded from the CMS website:

https://www.cms.gov/Medicare/Coding/NationalCorrectCodInitEd/index.html

https://www.cms.gov/medicare/coding-billing/ncci-medicaid/medicaid-ncci-edit-files

*While these edits are consistently utilized, state Medicaid and private insurers may modify them to meet their own programmatic needs. For this reason, it is important to verify the NCCI edit tables utilized by the payers you bill.

How to read the tables

PTP edits – For an individual client on the same date of service, the following is true:

• Codes in Column 1 can never be billed together with codes in Column 2 when a “0” is indicated in the modifier column.
• Codes in Column 1 can be billed together with codes in Column 2 by attaching the -59 modifier to bypass the code edit when a “1” is indicated in the modifier column. The -59 modifier indicates that the two procedures are separate and distinct (the use of the modifier must be supported in the medical record). Modifier -59 should be attached to the CPT code listed in Column 2.

In this example, 97168 OT re-evaluation and 97542 wheelchair management may be reported on the same day for the same client, where documentation supports that the provision of wheelchair management intervention was separate and distinct from the re-evaluation procedure, and the -59 modifier is appended to 97168 on the billing form.

MUEs edits – For an individual client on the same date of service, the following is true:

• The MUE value listed is the total number of units allowable for each CPT code.

In these MUE examples, on a given day for a given client, up to 8 units of 97535 self-care may be delivered; however, because 97150 group therapy is a service-based code that gets 1 unit regardless of the amount of time in the group, the MUE is 1, and a maximum of 1 unit may be billed.

NCCI edits are a foundational component of compliant billing, helping ensure that therapy services are coded and reimbursed accurately across payers. For occupational therapy practitioners, understanding how to interpret PTP edits, apply modifiers appropriately, and adhere to MUE limits is essential to accurately represent the services provided and avoid denials or overpayments. Because edit tables are updated regularly and may vary by payer, OTPs should consistently review current guidance and verify requirements to support accurate, ethical, and defensible billing practices.

For coding and billing questions or concerns, contact regulatory@aota.org.