ICD-10 Q31.8
Billable / Specific CCOther congenital malformations of larynx
About ICD-10-CM Q31.8
ICD-10-CM code Q31.8 represents Other congenital malformations of larynx. This is a billable/specific code in the Congenital Malformations chapter (block Q31). The 2026 edition of ICD-10-CM Q31.8 became effective on October 1, 2025.
Coding Tips for Q31.8
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
Q31.8 is designated CC for MS-DRG grouping. On inpatient claims, this code can shift the DRG to the with-CC variant when documented as a present-on-admission secondary diagnosis. Hospital CDI programs flag CC 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 Q31.8. Per CMS ICD-10-CM Tabular 2026.
- Absence of larynx
- Agenesis of larynx
- Atresia of larynx
- Congenital cleft thyroid cartilage
- Congenital fissure of epiglottis
- Congenital stenosis of larynx NEC
- Posterior cleft of cricoid cartilage
Inpatient DRG Impact, CC
codes Other congenital malformations of larynx. As a Complication/Comorbidity (CC), this contributes to DRG severity adjustment when documented alongside the principal diagnosis.
Medicare LCD Coverage for Q31.8
Local Coverage Determinations (LCDs) from CMS MACs that list Q31.8 as a covered diagnosis.
Showing top 10 of 104 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing Q31.8.
4 Medicare
1 Aetna
CPT Codes Commonly Billed with Q31.8
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 Q31.8 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 |
|---|---|---|
| Q31.8 | 7483 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To Q31.8
Other codes in section Q30-Q34 (Congenital malformations of the respiratory system).
ICD-10 Q31.8, Billing FAQ
Is ICD-10 code Q31.8 billable? +
Yes, Q31.8 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 Q31.8? +
ICD-10 Q31.8 includes: Absence of larynx; Agenesis of larynx; Atresia of larynx, and 4 more clinical synonyms.
Is Q31.8 a CC or MCC for inpatient DRG? +
Yes, this code is designated as CC. Documenting as a secondary diagnosis on inpatient claims can shift the DRG to a higher-weighted category.
What ICD-9 codes does Q31.8 map to? +
Per CMS GEMs, Q31.8 maps to ICD-9 codes: 7483. 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 May 31, 2026.
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