ICD-10 D12.1
Billable / SpecificBenign neoplasm of appendix
About ICD-10-CM D12.1
ICD-10-CM code D12.1 represents Benign neoplasm of appendix. This is a billable/specific code in the Neoplasms chapter (block D12). The 2026 edition of ICD-10-CM D12.1 became effective on October 1, 2025.
Type 1 Excludes
Pure excludes, these codes can never be coded together with D12.1. The conditions are mutually exclusive (e.g., congenital vs acquired forms).
- benign carcinoid tumor of the appendix (D3A.020)
Medicare LCD Coverage for D12.1
Local Coverage Determinations (LCDs) from CMS MACs that list D12.1 as a covered diagnosis.
Showing top 10 of 353 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing D12.1.
5 Medicare
CPT Codes Commonly Billed with D12.1
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
- 45385 Colonoscopy polypectomy — polyps found Gastroenterology
- 45385 Colonoscopy with polypectomy snare — colon polyps all sites, screening, personal/family hx polyps/cancer Gastroenterology
- 44408 CMS LCD: Billing and Coding: Diagnostic Colonoscopy CMS LCD
- 45379 CMS LCD: Billing and Coding: Diagnostic Colonoscopy CMS LCD
- 44406 CMS LCD: Billing and Coding: Diagnostic Colonoscopy CMS LCD
- 45390 CMS LCD: Billing and Coding: Diagnostic Colonoscopy CMS LCD
- 45392 CMS LCD: Billing and Coding: Diagnostic Colonoscopy CMS LCD
- 44394 CMS LCD: Billing and Coding: Diagnostic Colonoscopy CMS LCD
- 44402 CMS LCD: Billing and Coding: Diagnostic Colonoscopy CMS LCD
- 44390 CMS LCD: Billing and Coding: Diagnostic Colonoscopy CMS LCD
Convert D12.1 to ICD-9-CM
Per CMS General Equivalence Mappings (GEMs), useful for legacy data review and historical claim analysis.
| ICD-10 | ICD-9 | Mapping Flags |
|---|---|---|
| D12.1 | 2113 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To D12.1
Other codes in section D10-D36 (Benign neoplasms, except benign neuroendocrine tumors).
ICD-10 D12.1, Billing FAQ
Is ICD-10 code D12.1 billable? +
Yes, D12.1 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What codes are Type 1 Excludes for D12.1? +
Type 1 Excludes (never code together with D12.1): benign carcinoid tumor of the appendix (D3A.020)
What CPT codes are commonly billed with D12.1? +
Procedures frequently paired with D12.1 include: 45385, 45385, 44408, 45379, 44406.
What ICD-9 codes does D12.1 map to? +
Per CMS GEMs, D12.1 maps to ICD-9 codes: 2113. Useful for legacy data review and historical claim analysis.
Get the full PayerReady toolkit
Free access to CPT/ICD-10 lookup, denial appeals, fee comparator, and claim auditing with credentialing enrollment.
Start free →Run this code through our claim audit tool
Check NCCI bundling, MUE limits, and modifier logic before submission.
Try the auditor →Did this page help?
Quick signal so we know what to improve.
If you want a code reference page that doesn't exist yet, email coding@payerready.com.
Tell us what's missing or wrong: coding@payerready.com. We respond within 5 business days.
Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on June 1, 2026.
Powered by 11K CPT · 98K ICD-10 · 860K MPFS rates · 4.5M NCCI edits · 9.5M NPIs. Our data methodology · About our coding team