ICD-10 J45.909
Billable / SpecificUnspecified asthma, uncomplicated
About ICD-10-CM J45.909
ICD-10-CM code J45.909 represents Unspecified asthma, uncomplicated. This is a billable/specific code in the Respiratory System chapter (block J45). The 2026 edition of ICD-10-CM J45.909 became effective on October 1, 2025.
Coding Tips for J45.909
Specialist guidance from the PayerReady Medical Coding Team. Specificity warnings, HCC capture rules, sequencing notes.
Asthma unspecified uncomplicated. If severity is documented (mild intermittent, mild persistent, moderate persistent, severe persistent), use the specific code.
Inclusion Terms / Approximate Synonyms
Clinical terms and conditions classified under J45.909. Per CMS ICD-10-CM Tabular 2026.
- Asthma NOS
Type 2 Excludes
Not included here, the excluded code is not part of J45.909, but a patient may have both conditions at the same time. Both codes may be coded together when applicable.
- lung diseases due to external agents (J60-J70)
Medicare LCD Coverage for J45.909
Local Coverage Determinations (LCDs) from CMS MACs that list J45.909 as a covered diagnosis.
Showing top 10 of 484 total . Click a CPT for full coverage scope.
Commercial Payer Coverage
Coverage policies from major commercial payers referencing J45.909.
5 Medicare
CPT Codes Commonly Billed with J45.909
Procedures frequently paired with this diagnosis based on PayerReady's Dx↔Px linkage data.
- 95144 CMS LCD: Billing and Coding: Allergen Immunotherapy (AIT) with Subcutaneous Immunotherapy (SCIT) CMS LCD
- 95180 CMS LCD: Billing and Coding: Allergen Immunotherapy (AIT) with Subcutaneous Immunotherapy (SCIT) CMS LCD
- 95117 CMS LCD: Billing and Coding: Allergen Immunotherapy (AIT) with Subcutaneous Immunotherapy (SCIT) CMS LCD
- 86003 CMS LCD: Billing and Coding: RAST Type Tests CMS LCD
- 86001 CMS LCD: Billing and Coding: RAST Type Tests CMS LCD
- 86005 CMS LCD: Billing and Coding: RAST Type Tests CMS LCD
- 95070 CMS LCD: Billing and Coding: Allergy Testing CMS LCD
- 95052 CMS LCD: Billing and Coding: Allergy Testing CMS LCD
- 95065 CMS LCD: Billing and Coding: Allergy Testing CMS LCD
- 95027 CMS LCD: Billing and Coding: Allergy Testing CMS LCD
Convert J45.909 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 |
|---|---|---|
| J45.909 | 49390 | 10000 |
Flags format (5 digits): Approximate · No Map · Combination · Scenario · Choice List. Source: CMS 2017 GEMs (final version).
Codes Adjacent To J45.909
Other codes in section J40-J4A (Chronic lower respiratory diseases).
ICD-10 J45.909, Billing FAQ
Is ICD-10 code J45.909 billable? +
Yes, J45.909 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 J45.909? +
ICD-10 J45.909 includes: Asthma NOS.
What codes are Type 2 Excludes for J45.909? +
Type 2 Excludes (may be coded together when both conditions exist): lung diseases due to external agents (J60-J70)
What CPT codes are commonly billed with J45.909? +
Procedures frequently paired with J45.909 include: 95144, 95180, 95117, 86003, 86001.
What ICD-9 codes does J45.909 map to? +
Per CMS GEMs, J45.909 maps to ICD-9 codes: 49390. 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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