ICD-10 A70
Billable / Specific CCChlamydia psittaci infections
About ICD-10-CM A70
ICD-10-CM code A70 represents Chlamydia psittaci infections. This is a billable/specific code in the Infectious and Parasitic Diseases chapter (block A70). The 2026 edition of ICD-10-CM A70 became effective on October 1, 2025.
Coding Tips for A70
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
A70 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 A70. Per CMS ICD-10-CM Tabular 2026.
- Ornithosis
- Parrot fever
- Psittacosis
Inpatient DRG Impact, CC
code Chlamydia psittaci infections. As a Complication/Comorbidity (CC), this contributes to DRG severity adjustment when documented alongside the principal diagnosis.
Medicare LCD Coverage for A70
Local Coverage Determinations (LCDs) from CMS MACs that list A70 as a covered diagnosis.
Showing top 3. Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing A70.
1 Medicare
CPT Codes Commonly Billed with A70
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 A70 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 |
|---|---|---|
| A70 | 0739 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To A70
Other codes in section A70-A74 (Other diseases caused by chlamydiae).
ICD-10 A70, Billing FAQ
Is ICD-10 code A70 billable? +
Yes, A70 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 A70? +
ICD-10 A70 includes: Ornithosis; Parrot fever; Psittacosis.
Is A70 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 A70 map to? +
Per CMS GEMs, A70 maps to ICD-9 codes: 0739. 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