ICD-10 M99.21
Billable / SpecificSubluxation stenosis of neural canal of cervical region
About ICD-10-CM M99.21
ICD-10-CM code M99.21 represents Subluxation stenosis of neural canal of cervical region. This is a billable/specific code in the Musculoskeletal and Connective Tissue chapter (block M99). The 2026 edition of ICD-10-CM M99.21 became effective on October 1, 2025.
Medicare LCD Coverage for M99.21
Local Coverage Determinations (LCDs) from CMS MACs that list M99.21 as a covered diagnosis.
Showing top 10 of 624 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing M99.21.
2 Cigna
5 Medicare
CPT Codes Commonly Billed with M99.21
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
- 64479 CMS LCD: Billing and Coding: Epidural Steroid Injections for Pain Management CMS LCD
- 64484 CMS LCD: Billing and Coding: Epidural Steroid Injections for Pain Management CMS LCD
- 62321 CMS LCD: Billing and Coding: Epidural Steroid Injections for Pain Management CMS LCD
- 62323 CMS LCD: Billing and Coding: Epidural Steroid Injections for Pain Management CMS LCD
- 62320 CMS LCD: Billing and Coding: Epidural Steroid Injections for Pain Management CMS LCD
Convert M99.21 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 |
|---|---|---|
| M99.21 | 7230 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To M99.21
Other codes in section M99 (Biomechanical lesions, not elsewhere classified).
ICD-10 M99.21, Billing FAQ
Is ICD-10 code M99.21 billable? +
Yes, M99.21 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What CPT codes are commonly billed with M99.21? +
Procedures frequently paired with M99.21 include: 64479, 64484, 62321, 62323, 62320.
What ICD-9 codes does M99.21 map to? +
Per CMS GEMs, M99.21 maps to ICD-9 codes: 7230. 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 May 31, 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