`0321U`

What 0321U 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 0321U at 1 unit per date of service for practitioner claims (MAI 3 - date of service edit (clinical): units above the MUE may pay with documentation on appeal), rationale: Nature of Service/Procedure. Units above the cap are denied unless the edit's adjudication rules allow an appeal with documentation.

Billed with 0321U? These codes are bundled into it

0321U is a Column 1 code in 47 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
`0330U`		0 - no modifier bypass	Check pair
`0455U`		0 - no modifier bypass	Check pair
`0484U`		1 - modifier may bypass	Check pair
`0504U`		1 - modifier may bypass	Check pair
`80503`	Path clin consltj sf 5-20	1 - modifier may bypass	Check pair
`80504`	Path clin consltj mod 21-40	1 - modifier may bypass	Check pair
`80505`	Path clin consltj high 41-60	1 - modifier may bypass	Check pair
`80506`	Path clin consltj prolng svc	1 - modifier may bypass	Check pair
`81513`	Nfct ds bv rna vag flu alg	0 - no modifier bypass	Check pair
`81514`	Nfct ds bv&vaginitis dna alg	0 - no modifier bypass	Check pair
`81515`	Nfct ds bv&vaginitis dna alg	1 - modifier may bypass	Check pair
`87040`	Blood culture for bacteria	1 - modifier may bypass	Check pair
`87076`	Culture anaerobe ident each	1 - modifier may bypass	Check pair
`87077`	Culture aerobic identify	1 - modifier may bypass	Check pair
`87081`	Culture screen only	1 - modifier may bypass	Check pair
`87103`	Blood fungus culture	1 - modifier may bypass	Check pair
`87106`	Fungi identification yeast	1 - modifier may bypass	Check pair
`87107`	Fungi identification mold	1 - modifier may bypass	Check pair
`87181`	Sc std agar dilution per agt	1 - modifier may bypass	Check pair
`87184`	Sc std disk method per plate	1 - modifier may bypass	Check pair
`87185`	Sc std enzyme detcj per nzm	1 - modifier may bypass	Check pair
`87186`	Sc std microdil/agar dil	1 - modifier may bypass	Check pair
`87187`	Sc std microdil/agar mlc	1 - modifier may bypass	Check pair
`87188`	Sc std macrobroth dil meth	1 - modifier may bypass	Check pair
`87190`	Sc std myobacteria prop meth	1 - modifier may bypass	Check pair
`87482`	Candida dna quant	1 - modifier may bypass	Check pair
`88271`	Cytogenetics dna probe	1 - modifier may bypass	Check pair
`88272`	Cytogenetics 3-5	1 - modifier may bypass	Check pair
`88273`	Cytogenetics 10-30	1 - modifier may bypass	Check pair
`88274`	Cytogenetics 25-99	1 - modifier may bypass	Check pair

Showing 30 of 47 column 2 codes. Use the pair checker for any specific combination.

0321U is bundled into these codes

0321U appears as a Column 2 code in 305 active edits. Reported with one of these Column 1 codes on the same date of service, 0321U is the code that denies.

Column 1 code	Modifier indicator
`0001U`	1	Check pair
`0004M`	1	Check pair
`0005U`	1	Check pair
`0006M`	1	Check pair
`0007M`	1	Check pair
`0007U`	1	Check pair
`0008U`	1	Check pair
`0009U`	1	Check pair
`0010U`	1	Check pair
`0011M`	1	Check pair
`0012M`	1	Check pair
`0013M`	1	Check pair
`0016U`	1	Check pair
`0017U`	1	Check pair
`0018U`	1	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.