Coding errors
Unbundled charges — when one procedure gets billed as several
CMS publishes a public list — the National Correct Coding Initiative — defining exactly which CPT/HCPCS code combinations cannot be billed together. The list exists because the underlying procedures already include each other. When a single service shows up on a bill as multiple line items that NCCI flags, the duplicate-billing pattern is unambiguous.
Federal basis
CMS National Correct Coding Initiative (NCCI) Procedure-to-Procedure Edits
42 CFR §414.40 / CMS NCCI Policy Manual
Read the source →What this looks like in practice
The NCCI edits encode a basic principle: certain CPT/HCPCS codes are mutually inclusive — billing one already covers the other. Common examples: a comprehensive metabolic panel (80053) shouldn't be billed alongside its individual components (80048 basic metabolic + glucose + creatinine). A surgical procedure shouldn't be billed alongside a wound closure that's part of the standard surgical package. CMS updates the edit list quarterly; we check every consumer bill we audit against the current set.
The edit list is procedural-coding doctrine, not opinion. When a bill includes a flagged combination, the patient has a clear paper-citation basis for asking which code should stand and which should come off.
How to spot it on a bill
- 01.A panel test (e.g., 'CMP', 'BMP', 'CBC w/ diff') and the individual lab components are both itemized.
- 02.A surgical code is followed by line items for routine pre-op or immediate post-op services that are typically bundled.
- 03.An imaging study has both the global code and the technical-only or professional-only components separately.
What to write — ready-to-paste language
Replace the bracketed fields with your specific details. Send by certified mail with return receipt, or via the hospital’s patient portal if it offers documented messaging. Keep a copy.
On the bill dated [date], I see CPT [A] and CPT [B] both billed. Per the CMS National Correct Coding Initiative edits (42 CFR §414.40), this combination is bundled and should not be billed separately. I'm asking that one of the two codes be removed from the bill and the total adjusted accordingly. Please send a corrected itemized statement.
This is a starting point, not legal advice. Your specific situation may warrant additional details. Our scan tool drafts this letter automatically with your bill’s specifics filled in.
CPT codes commonly involved
These codes often appear in bills affected by this pattern. Click through for the federal benchmark price on each.
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Related scenarios
Upcoded ER visit — when the level on the bill doesn't match the chart
ER visits billed at a higher complexity level than the medical record supports are the most common billing-error pattern in the country. Federal coding rules let you dispute the level.
Wrong place-of-service code — facility billing for a non-facility visit
Place-of-service codes determine whether Medicare and most insurance pay the higher facility rate or the lower non-facility rate. A code mismatch can inflate a bill substantially.
Common questions
How do I check if two codes are bundled?
Does NCCI apply to commercial insurance?
P.S. The dispute language above is a starting point. Bills with this pattern often have additional issues alongside it — coding errors stacked with markup, surprise bills stacked with charity- care eligibility. The scan finds all of them in one pass. Start the audit →
P.P.S.Federal law gives you these rights regardless of how the bill arrived. Insured, uninsured, in-network, out-of-network — the underlying patient-protection statutes apply.
P.P.P.S. Bills are time-sensitive. Most insurance appeals must be filed within 180 days. Charity-care discounts at non-profit hospitals are most easily applied within 240 days of the original bill. Acting earlier costs less.