Double-Charge Detector 0079U

0079U — 377 bundling rules

If your bill lists 0079U alongside any of these codes as separate charges, it may be an unbundling error.

By David Park , Healthcare Cost Researcher · Published March 15, 2026 · Updated April 3, 2026

About the analyst

David Park researches procedure pricing and insurance reimbursement patterns at BillRazor Research. He specializes in cost comparison across care settings and metropolitan areas. Expertise: procedure pricing, insurance reimbursement, cost comparison.

NCCI edit data

377 code pairs

Updated 2026-04-03

Bundling rules — 0079U

NCCI edits: these codes have billing restrictions when billed with 0079U

Research suggests 49–80% of hospital bills contain errors. Our system checks every line item against Medicare benchmarks.

Common unbundling errors — medical procedures

Unbundling occurs when medical providers bill two separate codes for services that should be combined into a single charge according to National Correct Coding Initiative (NCCI) rules. In other procedures including anesthesia, radiology, pathology, and miscellaneous support services, common unbundling patterns include separately billing diagnostic imaging with its professional interpretation when both should be included in one comprehensive code, and charging for basic monitoring or preparation services alongside the primary procedure when these components are considered integral parts of the main service. Another frequent error involves billing multiple pathology examination codes for what constitutes a single comprehensive analysis. With 809 other codes subject to bundling restrictions in the NCCI database, these errors create charges above the benchmark for patients who receive multiple bills for what should constitute one complete service. The potential difference between unbundled billing and correct coding practices can significantly impact patient financial responsibility, as they may face duplicate charges for components of care that medical coding standards define as a single billable service.

What to check on your bill

When reviewing itemized bills for procedure bundling issues, patients should examine several key areas to identify potential billing irregularities. Look for multiple procedure codes billed on the same date that represent components of a comprehensive service, such as separate charges for incision, repair, and closure when these steps are typically included in one primary procedure code. Watch for code patterns where related procedures share the same first three digits, as these often indicate services that should be bundled together under Medicare's Correct Coding Initiative. Check for appropriate modifier usage, particularly modifier 59 or XS, which legitimately allow separate billing when procedures are performed on different anatomical sites or during distinct sessions. Without proper modifiers, separately billed related procedures may represent charges above the benchmark. Compare your itemized statement against standard bundling practices for your specific procedure type to identify potential differences in billing patterns.

All bundling rules for 0079U

377 code pairs that have billing restrictions with this procedure.

241

Never bill together

136

May bill with modifier

Code	Description	Rule
0009U	Onc brst ca erbb2 amp/nonamp	May bill with modifier
0071U	Cyp2d6 full gene sequence	Never bill together
0086U	Nfct ds bact&fng org id 6+	May bill with modifier
0111U	Onc colon ca kras&nras alys	Never bill together
0112U	Iadi 16s&18s rrna genes	May bill with modifier
0115U	Respir iadna 18 viral&2 bact	May bill with modifier
0136U	Atm mrna seq alys	Never bill together
0137U	Palb2 mrna seq alys	Never bill together
0138U	Brca1 brca2 mrna seq alys	Never bill together
0140U	Nfct ds fungi dna 15 trgt	May bill with modifier
0141U	Nfct ds bact&fng gram pos	May bill with modifier
0142U	Nfct ds bact&fng gram neg	May bill with modifier
0155U	Onc brst ca dna pik3ca gene	Never bill together
0156U	Copy number sequence alys	Never bill together
0157U	Apc mrna seq alys	Never bill together
0158U	Mlh1 mrna seq alys	Never bill together
0159U	Msh2 mrna seq alys	Never bill together
0160U	Msh6 mrna seq alys	Never bill together
0161U	Pms2 mrna seq alys	Never bill together
0177U	Onc brst ca dna pik3ca 11	Never bill together
0202U	Nfct ds 22 trgt sars-cov-2	May bill with modifier
0212U	Rare ds gen dna alys proband	Never bill together
0213U	Rare ds gen dna alys ea comp	Never bill together
0229U	Bcat1&ikzf1 prmtr mthyln aly	Never bill together
0230U	Ar full sequence analysis	Never bill together
0231U	Cacna1a full gene analysis	Never bill together
0232U	Cstb full gene analysis	Never bill together
0233U	Fxn gene analysis	Never bill together
0234U	Mecp2 full gene analysis	Never bill together
0235U	Pten full gene analysis	Never bill together
0236U	Smn1&smn2 full gene analysis	Never bill together
0252U	Ftl aneuploidy str alys dna	Never bill together
0318U	Ped whl gen mthyltn alys 50+	Never bill together
0321U	Iadna gu pthgn 20bct&fng org	May bill with modifier
0330U	Iadna vag pthgn panel 27 org	May bill with modifier
0336U	Rare ds whl gen seq bld/slv	Never bill together
0341U	Ftl aneup dna seq cmpr alys	Never bill together
0425U	Genom rpd seq alys ea cmprtr	Never bill together
0454U	Rare ds id opt genome mapg	May bill with modifier
0469U	Rare ds whl gen seq ftl samp	May bill with modifier
80503	Path clin consltj sf 5-20	May bill with modifier
80504	Path clin consltj mod 21-40	May bill with modifier
80505	Path clin consltj high 41-60	May bill with modifier
80506	Path clin consltj prolng svc	May bill with modifier
81105	Hpa-1 genotyping	Never bill together
81106	Hpa-2 genotyping	Never bill together
81107	Hpa-3 genotyping	Never bill together
81108	Hpa-4 genotyping	Never bill together
81109	Hpa-5 genotyping	Never bill together
81110	Hpa-6 genotyping	Never bill together

Showing 50 of 377 rules. Show all

FAQ — medical procedure bundling

What is NCCI bundling and what does 'bundled' mean on a medical bill?

NCCI bundling refers to the National Correct Coding Initiative rules that prevent certain procedure codes from being billed separately when performed together. When codes are bundled, one procedure is considered inclusive of another, meaning only the primary procedure should be billed rather than charging for each component separately.

How can I identify if codes were incorrectly unbundled on my bill?

Incorrectly unbundled codes appear as separate line items on your bill when NCCI rules indicate they should be grouped together under one primary procedure code. This typically occurs with anesthesia, radiology, pathology, and miscellaneous support services that are considered integral to the main procedure being performed.

What should I do if I find unbundled charges on my medical bill?

Contact your healthcare provider's billing department to request a review of the charges and provide documentation showing the NCCI bundling rules that apply. Request an itemized explanation of why the codes were billed separately and ask for a corrected bill that reflects proper bundling if no valid modifier justification exists.

When is it legitimate to use modifiers to override NCCI bundling rules?

Modifiers are appropriately used when procedures are performed on different anatomical sites, during separate patient encounters, or when distinct procedural services are provided that don't fall under the bundling restrictions. The modifier usage must be supported by clear documentation in the medical record that demonstrates the services were truly separate and distinct from the bundled procedure.

Rates shown are from the 2026 Medicare Physician Fee Schedule and CMS IPPS. BillRazor compares your bill against these data sources. See how it works →

Data source: CMS National Correct Coding Initiative (NCCI) Procedure-to-Procedure (PTP) edits, updated quarterly. These code pairs are maintained by CMS to prevent improper billing of services that should be billed as a single procedure.

What this means: When two codes are listed as an NCCI edit pair, billing them separately on the same date of service is typically incorrect. "Never bill together" means no modifier can override the rule. "May bill with modifier" means the codes can be billed separately with appropriate documentation.