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ICD-10-CM codes for Asthma

The ICD-10-CM Index to Diseases lists asthma under "Asthma, asthmatic(bronchial) (catarrh) (spasmodic)". Without more detail in the record it is coded J45.909, unspecified asthma, uncomplicated, in tabular category J45 (Asthma). The tabular list also files Asthma NOS under J45.909. More specific documentation changes the code, for example with, chronic obstructive bronchitis: J44.89; with, chronic obstructive pulmonary disease: J44.89; with, exacerbation(acute): J45.901.

Compiled from CMS files by the QuickIntell RCM Editorial Team · Data effective · Method: reference methodology · Report a data correction

Data currency: ICD-10-CM code descriptions: FY2027 (effective October 1, 2026). Next CMS release: FY2028 code files, effective October 1, 2027.

Default code: J45.909 Unspecified asthma, uncomplicated

Index to Diseases entry: Asthma, asthmatic(bronchial) (catarrh) (spasmodic)

Each row is a subterm under the entry. Indented rows refine the row above; “see” sends you to another entry. Look the code up in the tabular list before reporting it: the tabular notes can require a more specific or an additional code.

ICD-10-CM index subterms under "Asthma, asthmatic(bronchial) (catarrh) (spasmodic)"
DocumentationCodeCode description or cross-reference
with—
chronic obstructive bronchitisJ44.89Other specified chronic obstructive pulmonary disease
chronic obstructive pulmonary diseaseJ44.89Other specified chronic obstructive pulmonary disease
exacerbation(acute)J45.901Unspecified asthma with (acute) exacerbation
hay fever—see Asthma, allergic extrinsic
rhinitis, allergic—see Asthma, allergic extrinsic
status asthmaticusJ45.902Unspecified asthma with status asthmaticus
allergic extrinsicJ45.909Unspecified asthma, uncomplicated
with—
atopic—see Asthma, allergic extrinsic
cardiac—see Failure, ventricular, left
cardiobronchialI50.1Left ventricular failure, unspecified
childhoodJ45.909Unspecified asthma, uncomplicated
with—
chronic obstructiveJ44.89Other specified chronic obstructive pulmonary disease
with—
collier'sJ60Coalworker's pneumoconiosis
cough variantJ45.991Cough variant asthma
detergentJ69.8Pneumonitis due to inhalation of other solids and liquids
due to—
detergentJ69.8Pneumonitis due to inhalation of other solids and liquids
inhalation of fumesJ68.3Other acute and subacute respiratory conditions due to chemicals, gases, fumes and vapors
eosinophilicJ82.83Eosinophilic asthma
extrinsic, allergic—see Asthma, allergic extrinsic
grinder'sJ62.8Pneumoconiosis due to other dust containing silica
hay—see Asthma, allergic extrinsic
heartI50.1Left ventricular failure, unspecified
idiosyncratic—see Asthma, nonallergic
intermittent(mild)J45.20Mild intermittent asthma, uncomplicated
with—
intrinsic, nonallergic—see Asthma, nonallergic
Kopp'sE32.8Other diseases of thymus
late-onsetJ45.909Unspecified asthma, uncomplicated
with—
mild intermittentJ45.20Mild intermittent asthma, uncomplicated
with—
mild persistentJ45.30Mild persistent asthma, uncomplicated
with—
Millar's(laryngismus stridulus)J38.5Laryngeal spasm
miner'sJ60Coalworker's pneumoconiosis
mixedJ45.909Unspecified asthma, uncomplicated
with—
moderate persistentJ45.40Moderate persistent asthma, uncomplicated
with—
nervous—see Asthma, nonallergic
nonallergic(intrinsic)J45.909Unspecified asthma, uncomplicated
with—
persistent—
mildJ45.30Mild persistent asthma, uncomplicated
moderateJ45.40Moderate persistent asthma, uncomplicated
severeJ45.50Severe persistent asthma, uncomplicated
platinumJ45.998Other asthma
pneumoconiotic NECJ64Unspecified pneumoconiosis
potter'sJ62.8Pneumoconiosis due to other dust containing silica
predominantly allergicJ45.909Unspecified asthma, uncomplicated
psychogenicF54Psychological and behavioral factors associated with disorders or diseases classified elsewhere
pulmonary eosinophilicJ82.83Eosinophilic asthma
red cedarJ67.8Hypersensitivity pneumonitis due to other organic dusts
Rostan'sI50.1Left ventricular failure, unspecified
sandblaster'sJ62.8Pneumoconiosis due to other dust containing silica
sequoiosisJ67.8Hypersensitivity pneumonitis due to other organic dusts
severe persistentJ45.50Severe persistent asthma, uncomplicated
with—
specified NECJ45.998Other asthma
stonemason'sJ62.8Pneumoconiosis due to other dust containing silica
thymicE32.8Other diseases of thymus
tuberculous—see Tuberculosis, pulmonary
Wichmann's(laryngismus stridulus)J38.5Laryngeal spasm
woodJ67.8Hypersensitivity pneumonitis due to other organic dusts

Tabular list notes for J45.909

Inclusion terms
  • Asthma NOS
Excludes2 (not part of this condition, may be coded together)
  • lung diseases due to external agents (J60-J70)

How to read an Index to Diseases entry

  • Words in parentheses after a term are nonessential modifiers: they may or may not appear in the record, and they do not change the code.
  • Indented subterms are essential modifiers. Each one describes a different site, type or cause, and when the record supports it, the subterm's code replaces the default code.
  • “With” and “in” link two conditions. The Official Guidelines presume a causal relationship between conditions linked by “with” in the index unless the provider documents that they are unrelated.
  • “See” sends you to another entry that holds the code; “see also” points to another entry that may be useful.
  • A code that ends in a dash, such as I50.-, is incomplete: the tabular list gives the characters it still needs.
  • Never report a code from the index alone. Find it in the tabular list and apply its includes, excludes, code first, use additional code and 7th-character instructions before you report it.

Once the code is settled, check what it does for payment: the HCC lookup for risk adjustment, the CC/MCC exclusion check for inpatient severity, and the LCD code lookup for local coverage of the service it supports. The guide to ICD-10 diagnosis codes explains the code structure.

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Frequently asked questions

What is the ICD-10 code for asthma?

J45.909 (Unspecified asthma, uncomplicated) is the code the index assigns to "Asthma, asthmatic(bronchial) (catarrh) (spasmodic)" with no further detail. Confirm it in the tabular list before reporting it, because the tabular notes can require a different or additional code.

Which documentation changes the code for asthma?

The index lists 39 subterms with their own codes, including with chronic obstructive bronchitis (J44.89); with chronic obstructive pulmonary disease (J44.89); with exacerbation(acute) (J45.901); with status asthmaticus (J45.902); cardiobronchial (I50.1).

Sources

Every figure on this page is taken from the CMS publications below, as released by the Centers for Medicare & Medicaid Services. Projection built 2026-10-10. Verify against the primary file before billing or contracting decisions. The reference methodology explains how each figure is computed from these files.

Disclaimer

The entry, subterms and codes are reproduced from the FY2027 ICD-10-CM index; code descriptions are from the FY2027 code files. Code from the medical record using both the index and the tabular list, under the ICD-10-CM Official Guidelines. Not legal, clinical or billing advice.

Found a figure that does not match the CMS file? Report a data correction with the CMS file and the value you expected; the request reaches the editorial team through the contact form.