J44.89 (Other specified chronic obstructive pulmonary disease) compared with J45.909 (Unspecified asthma, uncomplicated), from the official CMS tabular data. Both may be reported when both conditions are documented (Excludes2). MedCoder-derived
Both codes may be needed to fully describe the condition.
“type of asthma, if applicable (J45.-)”
A "Code Also" note means two codes may be required together, but the Guidelines state no sequencing order for it -- sequence by the reason for the encounter, not by this relationship.
Source: CMS ICD-10-CM tabular instructional notes
Distinct conditions — both may be reported.
“asthma with chronic obstructive pulmonary disease (J44.89)”
An Excludes2 note means the excluded condition is not part of the code above it, but a patient can have both. Report both when both are documented.
Source: CMS ICD-10-CM tabular instructional notes
Both codes may be needed together. J44.89 carries a Code Also note covering J45.909: “type of asthma, if applicable (J45.-)”
A Code Also note means the two codes may both be required to fully describe the condition. CMS states no sequencing order for it — sequence by the reason for the encounter.
Yes, when both are documented. J45.909 carries an Excludes2 note covering J44.89: “asthma with chronic obstructive pulmonary disease (J44.89)”
Excludes2 marks distinct conditions — both may be reported when both are documented.
| J44.89Other specified chronic obstructive pulmonary disease | J45.909Unspecified asthma, uncomplicated | |
|---|---|---|
| Billing status | Billable | Billable |
| Classification | J00-J99 — Diseases of the Respiratory System (J00-J99) | J00-J99 — Diseases of the Respiratory System (J00-J99) |
| Definition | Other specified chronic obstructive pulmonary disease is a billable ICD-10-CM diagnosis code (J44.89). | Unspecified asthma, uncomplicated is a billable ICD-10-CM diagnosis code (J45.909). |
| Includes | asthma with chronic obstructive pulmonary disease chronic asthmatic (obstructive) bronchitis chronic bronchitis with airway obstruction chronic bronchitis with emphysema | allergic (predominantly) asthma allergic bronchitis NOS allergic rhinitis with asthma atopic asthma |
| Use additional code | — | code to identify: eosinophilic asthma (J82.83) exposure to environmental tobacco smoke (Z77.22) |
J45.909 is asthma standing alone — unspecified type, no exacerbation, no status asthmaticus — while J44.89 is where the classification puts asthma that coexists with COPD: its Includes list names “asthma with chronic obstructive pulmonary disease” and “chronic obstructive asthma” outright, and its Code Also note then brings the asthma type code back alongside.
Does the record document COPD together with the asthma?
Documented asthma with COPD classifies to J44.89 — J45.909’s Excludes2 routes “asthma with chronic obstructive pulmonary disease” and “chronic obstructive asthma” there — and J44.89’s Code Also note (“type of asthma, if applicable (J45.-)”) adds the documented asthma type after it. Asthma documented without obstructive disease, with no severity class and no exacerbation, stays at J45.909.
A refill visit documents “asthma, stable on albuterol” — no severity class, no exacerbation, no mention of COPD.
A documented severity class would move this to the J45.2–J45.5 categories instead.
The provider documents chronic obstructive asthma — asthma and COPD together — at a stable follow-up.
When the record states the asthma type or severity, that more specific J45.- code takes the additional slot instead.
Excludes2 is the softest instruction in the tabular — “not included here” — so coders reasonably read J45.909’s note as permission to keep J45.909 and simply add a COPD code. The catch is that the excluded terms are combination diagnoses in their own right: “asthma with COPD” is an Includes term ON J44.89, so the combination already has a home, and the note’s parenthetical is pointing at it.
The pairing also runs backwards from intuition: the less specific-sounding code (J44.89, “other specified COPD”) leads, and the asthma code follows it — because J44.89 carries the combination and its Code Also note explicitly calls the asthma type back in.
Yes — that is the designed pairing when asthma coexists with COPD and no more specific asthma type is documented. J44.89 carries the combination, and its Code Also note (“type of asthma, if applicable”) adds the J45.- code after it. The relationship is Excludes2, which permits both together.
No. With COPD documented, the encounter lives in the J44.- family, and the exacerbation axis moves with it (J44.1 is COPD with acute exacerbation); the asthma-type code that rides along per the Code Also note would itself reflect any documented exacerbation. J45.909 is specifically the no-exacerbation, no-COPD floor.
The Chapter 10 guideline defines an acute exacerbation as a worsening or decompensation of the chronic condition and states it is not equivalent to an infection superimposed on it, though an infection may trigger one. The deciding documentation element is the provider describing the asthma or COPD itself as exacerbated.
Excludes1 vs Excludes2: what each note permits·J44.1 — COPD with acute exacerbation·J45.901 — Unspecified asthma with acute exacerbation
Derived from the official CMS ICD-10-CM tabular data (FY2026). Not billing advice; verify sequencing rules for the encounter. All data sources