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ICD-10-CM 2027

ICD-10 code for moderate persistent asthma

J45.40

Moderate persistent asthma, uncomplicated

✓ Billable / specific

From the official ICD-10-CM alphabetic index entry “Asthma, asthmatic (bronchial) (catarrh) (spasmodic) › moderate persistent”. Page updated September 29, 2026.

About coding moderate persistent asthma

The ICD-10-CM code for moderate persistent asthma is J45.40 (Moderate persistent asthma, uncomplicated). The official index lists 2 more specific codes, so check the documentation for details such as type, cause, site or severity before settling on J45.40.

Within J45.4 (moderate persistent asthma), J45.40 is specifically for moderate persistent asthma, uncomplicated. Related codes cover with (acute) exacerbation (J45.41) and with status asthmaticus (J45.42).

Use an additional code to identify: eosinophilic asthma (J82.83), exposure to environmental tobacco smoke (Z77.22), exposure to tobacco smoke in the perinatal period (P96.81), history of tobacco dependence (Z87.891), occupational exposure to environmental tobacco smoke (Z57.31) and 2 more.

It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.

More specific moderate persistent asthma codes (official index)

  • with
  • exacerbation (acute) J45.41 — Moderate persistent asthma with (acute) exacerbation
  • status asthmaticus J45.42 — Moderate persistent asthma with status asthmaticus

Common questions about moderate persistent asthma ICD-10 codes

What is the ICD-10 code for moderate persistent asthma?

J45.40 — Moderate persistent asthma, uncomplicated. More specific codes apply when the documentation supports them: J45.41, J45.42.

Is J45.40 billable?

Yes. J45.40 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can J45.40 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict J45.40 as a principal diagnosis.

Is J45.40 a CC or MCC?

No. J45.40 is neither a CC nor an MCC under MS-DRG v44.0.