Onc clrct&lng dna ngs 8genes — 28 bundling rules
If your bill lists 0499U alongside any of these codes as separate charges, it may be an unbundling error.
About the analyst
Kevin Nyk analyzes hospital pricing data at BillRazor Research. He specializes in Medicare reimbursement patterns and chargemaster pricing across U.S. hospitals. Expertise: hospital pricing, Medicare rates, chargemaster analysis.
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 0499U
28 code pairs that have billing restrictions with this procedure.
| Code | Description | Rule |
|---|---|---|
| 0091U | 0091U | May bill with modifier |
| 81202 | Apc gene known fam variants | May bill with modifier |
| 81203 | Apc gene dup/delet variants | May bill with modifier |
| 81210 | Braf gene | Never bill together |
| 81235 | Egfr gene com variants | May bill with modifier |
| 81275 | Kras gene variants exon 2 | Never bill together |
| 81276 | Kras gene addl variants | Never bill together |
| 81288 | Mlh1 gene | May bill with modifier |
| 81293 | Mlh1 gene known variants | May bill with modifier |
| 81294 | Mlh1 gene dup/delete variant | May bill with modifier |
| 81295 | Msh2 gene full seq | May bill with modifier |
| 81296 | Msh2 gene known variants | May bill with modifier |
| 81297 | Msh2 gene dup/delete variant | May bill with modifier |
| 81299 | Msh6 gene known variants | May bill with modifier |
| 81300 | Msh6 gene dup/delete variant | May bill with modifier |
| 81301 | Microsatellite instability | May bill with modifier |
| 81318 | Pms2 known familial variants | May bill with modifier |
| 81319 | Pms2 gene dup/delet variants | May bill with modifier |
| 81327 | Sept9 gen prmtr mthyltn alys | May bill with modifier |
| 81352 | Tp53 gene trgt sequence alys | Never bill together |
| 81353 | Tp53 gene known famil vrnt | Never bill together |
| 81400 | Mopath procedure level 1 | May bill with modifier |
| 81401 | Mopath procedure level 2 | May bill with modifier |
| 81402 | Mopath procedure level 3 | May bill with modifier |
| 81403 | Mopath procedure level 4 | May bill with modifier |
| 81404 | Mopath procedure level 5 | May bill with modifier |
| 81405 | Mopath procedure level 6 | May bill with modifier |
| 81406 | Mopath procedure level 7 | May bill with modifier |
FAQ — medical procedure bundling
What is NCCI bundling and what does 'bundled' mean on a medical bill?
How can I identify if codes were incorrectly unbundled on my bill?
What should I do if I find unbundled charges on my medical bill?
When is it legitimate to use modifiers to override NCCI bundling rules?
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.