0400U
What 0400U is
This code appears in the Medicare NCCI edit tables. It has no RVUs in the CY2026 Physician Fee Schedule file.
Medically Unlikely Edit (MUE)
Medicare caps 0400U at 1 unit per date of service for practitioner claims (MAI 2 - date of service edit (absolute): units above the MUE never pay), rationale: Code Descriptor / CPT Instruction. Units above the cap are denied unless the edit's adjudication rules allow an appeal with documentation.
Billed with 0400U? These codes are bundled into it
0400U is a Column 1 code in 11 active NCCI PTP edits. When one of these Column 2 codes is reported on the same date of service, it is denied as bundled - unless the edit's modifier indicator is 1 and documentation supports a distinct service with an NCCI-associated modifier.
| Column 2 code | Short description | Modifier indicator | |
|---|---|---|---|
0482U | 1 - modifier may bypass | Check pair | |
81220 | Cftr gene com variants | 1 - modifier may bypass | Check pair |
81221 | Cftr gene known fam variants | 1 - modifier may bypass | Check pair |
81222 | Cftr gene dup/delet variants | 1 - modifier may bypass | Check pair |
81223 | Cftr gene full sequence | 1 - modifier may bypass | Check pair |
81224 | Cftr gene intron poly t | 1 - modifier may bypass | Check pair |
81328 | Slco1b1 gene com variants | 1 - modifier may bypass | Check pair |
81329 | Smn1 gene dos/deletion alys | 1 - modifier may bypass | Check pair |
81405 | Mopath procedure level 6 | 1 - modifier may bypass | Check pair |
81406 | Mopath procedure level 7 | 1 - modifier may bypass | Check pair |
81407 | Mopath procedure level 8 | 1 - modifier may bypass | Check pair |
Data: CMS CY2026 Physician Fee Schedule RVU file (October release, RVU26D) and Medicare NCCI PTP practitioner edits v32.3 (2026 Q4). Verify against the official files before billing or contracting decisions.