`0166U`

What 0166U 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 0166U 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 0166U? These codes are bundled into it

0166U is a Column 1 code in 23 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
`0002M`		0 - no modifier bypass	Check pair
`0468U`		1 - modifier may bypass	Check pair
`80047`	Basic metablc pnl ionized ca	0 - no modifier bypass	Check pair
`80048`	Basic metabolic pnl total ca	0 - no modifier bypass	Check pair
`80050`	General health panel	0 - no modifier bypass	Check pair
`80053`	Comprehen metabolic panel	0 - no modifier bypass	Check pair
`80061`	Lipid panel	0 - no modifier bypass	Check pair
`80069`	Renal function panel	0 - no modifier bypass	Check pair
`80076`	Hepatic function panel	0 - no modifier 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
`82172`	Assay of apolipoprotein	1 - modifier may bypass	Check pair
`82247`	Bilirubin total	1 - modifier may bypass	Check pair
`82465`	Assay bld/serum cholesterol	0 - no modifier bypass	Check pair
`82947`	Assay glucose blood quant	1 - modifier may bypass	Check pair
`82977`	Assay of ggt	0 - no modifier bypass	Check pair
`83010`	Assay of haptoglobin quant	0 - no modifier bypass	Check pair
`84450`	Transferase (ast) (sgot)	0 - no modifier bypass	Check pair
`84460`	Alanine amino (alt) (sgpt)	0 - no modifier bypass	Check pair
`84478`	Assay of triglycerides	0 - no modifier bypass	Check pair
`96523`	Irrig drug delivery device	0 - no modifier bypass	Check pair

0166U is bundled into these codes

0166U appears as a Column 2 code in 2 active edits. Reported with one of these Column 1 codes on the same date of service, 0166U is the code that denies.

Column 1 code	Short description	Modifier indicator
`0333U`		0	Check pair
`0344U`		0	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.