ICD-10 A37.90
Billable / Specific CCWhooping cough, unspecified species without pneumonia
About ICD-10-CM A37.90
ICD-10-CM code A37.90 represents Whooping cough, unspecified species without pneumonia. This is a billable/specific code in the Infectious and Parasitic Diseases chapter (block A37). The 2026 edition of ICD-10-CM A37.90 became effective on October 1, 2025.
Coding Tips for A37.90
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
A37.90 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.
Inpatient DRG Impact, CC
codes Whooping cough, unspecified species without pneumonia. As a Complication/Comorbidity (CC), this contributes to DRG severity adjustment when documented alongside the principal diagnosis.
Medicare LCD Coverage for A37.90
Local Coverage Determinations (LCDs) from CMS MACs that list A37.90 as a covered diagnosis.
Showing top 10 of 570 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing A37.90.
5 Medicare
CPT Codes Commonly Billed with A37.90
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
- 94726 CMS LCD: Billing and Coding: Respiratory Therapy (Respiratory Care) CMS LCD
- 94004 CMS LCD: Billing and Coding: Respiratory Therapy (Respiratory Care) CMS LCD
- 94621 CMS LCD: Billing and Coding: Respiratory Therapy (Respiratory Care) CMS LCD
- 94011 CMS LCD: Billing and Coding: Respiratory Therapy (Respiratory Care) CMS LCD
- 94003 CMS LCD: Billing and Coding: Respiratory Therapy (Respiratory Care) CMS LCD
- 94668 CMS LCD: Billing and Coding: Respiratory Therapy (Respiratory Care) CMS LCD
- 94070 CMS LCD: Billing and Coding: Respiratory Therapy (Respiratory Care) CMS LCD
- 94664 CMS LCD: Billing and Coding: Respiratory Therapy (Respiratory Care) CMS LCD
- 94012 CMS LCD: Billing and Coding: Respiratory Therapy (Respiratory Care) CMS LCD
- 31502 CMS LCD: Billing and Coding: Respiratory Therapy (Respiratory Care) CMS LCD
Convert A37.90 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 |
|---|---|---|
| A37.90 | 0339 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To A37.90
Other codes in section A30-A49 (Other bacterial diseases).
ICD-10 A37.90, Billing FAQ
Is ICD-10 code A37.90 billable? +
Yes, A37.90 is a billable ICD-10-CM code that can appear as a primary or secondary diagnosis on claims.
Is A37.90 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 CPT codes are commonly billed with A37.90? +
Procedures frequently paired with A37.90 include: 94726, 94004, 94621, 94011, 94003.
What ICD-9 codes does A37.90 map to? +
Per CMS GEMs, A37.90 maps to ICD-9 codes: 0339. 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