ICD-10 Q28.2
Billable / Specific MCCArteriovenous malformation of cerebral vessels
About ICD-10-CM Q28.2
ICD-10-CM code Q28.2 represents Arteriovenous malformation of cerebral vessels. This is a billable/specific code in the Congenital Malformations chapter (block Q28). The 2026 edition of ICD-10-CM Q28.2 became effective on October 1, 2025.
Coding Tips for Q28.2
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
Q28.2 is designated MCC for MS-DRG grouping. On inpatient claims, this code can shift the DRG to the with-MCC variant when documented as a present-on-admission secondary diagnosis. Hospital CDI programs flag MCC opportunities during chart review. Failure to capture this code may leave 30 to 80 percent of the inpatient stay revenue unrealized.
Inclusion Terms / Approximate Synonyms
Clinical terms and conditions classified under Q28.2. Per CMS ICD-10-CM Tabular 2026.
- Arteriovenous malformation of brain NOS
- Congenital arteriovenous cerebral aneurysm (nonruptured)
Inpatient DRG Impact, MCC
codes Arteriovenous malformation of cerebral vessels. As a Major Complication/Comorbidity (MCC), this can shift the DRG assignment to a higher-weighted category, substantial reimbursement impact.
Medicare LCD Coverage for Q28.2
Local Coverage Determinations (LCDs) from CMS MACs that list Q28.2 as a covered diagnosis.
Showing top 10 of 320 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing Q28.2.
1 Aetna
3 Cigna
5 Medicare
CPT Codes Commonly Billed with Q28.2
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
We don't have CPT pairings indexed for this specific code yet. Use the CPT search above to find common procedures, or check your payer's published medical policy for code-specific guidance.
Convert Q28.2 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 |
|---|---|---|
| Q28.2 | 74781 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To Q28.2
Other codes in section Q20-Q28 (Congenital malformations of the circulatory system).
ICD-10 Q28.2, Billing FAQ
Is ICD-10 code Q28.2 billable? +
Yes, Q28.2 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
What other names or terms map to Q28.2? +
ICD-10 Q28.2 includes: Arteriovenous malformation of brain NOS; Congenital arteriovenous cerebral aneurysm (nonruptured).
Is Q28.2 a CC or MCC for inpatient DRG? +
Yes, this code is designated as MCC. Documenting as a secondary diagnosis on inpatient claims can shift the DRG to a higher-weighted category.
What ICD-9 codes does Q28.2 map to? +
Per CMS GEMs, Q28.2 maps to ICD-9 codes: 74781. Useful for legacy data review and historical claim analysis.
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Reviewed by the PayerReady Medical Coding Team
Verified against the CMS 2026 code set on June 1, 2026.
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