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Double-Charge Detector 0402U

Nfct agt sti mult amp prb tq — 23 bundling rules

If your bill lists 0402U alongside any of these codes as separate charges, it may be an unbundling error.

By David Park , Healthcare Cost Researcher · ·
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
23 code pairs
Updated 2026-04-03
Bundling rules — 0402U
NCCI edits: these codes have billing restrictions when billed with 0402U
0402U80503Path clin consltj sf 5-20May bill with modifier80504Path clin consltj mod 21-40May bill with modifier80505Path clin consltj high 41-60May bill with modifier81400Mopath procedure level 1May bill with modifier81401Mopath procedure level 2May bill with modifier87206Smear fluorescent/acid staiMay bill with modifier87210Smear wet mount saline/inkMay bill with modifier87270Chlamydia trachomatis ag ifMay bill with modifier
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 0402U

23 code pairs that have billing restrictions with this procedure.

1
Never bill together
22
May bill with modifier
Code Description Rule
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
81400 Mopath procedure level 1 May bill with modifier
81401 Mopath procedure level 2 May bill with modifier
87206 Smear fluorescent/acid stai May bill with modifier
87210 Smear wet mount saline/ink May bill with modifier
87270 Chlamydia trachomatis ag if May bill with modifier
87320 Chlmyd trach ag ia May bill with modifier
87490 Chlmyd trach dna dir probe May bill with modifier
87491 Chlmyd trach dna amp probe May bill with modifier
87492 Chlmyd trach dna quant May bill with modifier
87590 N.gonorrhoeae dna dir prob May bill with modifier
87591 N.gonorrhoeae dna amp prob May bill with modifier
87592 N.gonorrhoeae dna quant May bill with modifier
87660 Trichomonas vagin dir probe May bill with modifier
87661 Trichomonas vaginalis amplif May bill with modifier
87800 Detect agnt mult dna direc May bill with modifier
87801 Detect agnt mult dna ampli May bill with modifier
87808 Trichomonas assay w/optic May bill with modifier
87810 Chlmyd trach assay w/optic May bill with modifier
87850 N. gonorrhoeae assay w/optic May bill with modifier
96523 Irrig drug delivery device Never bill together

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.

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