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ICD-10-CM J45.990: Exercise induced bronchospasm

J45.990 is the billable ICD-10-CM code for exercise induced bronchospasm, in category J45 (Asthma) of the Chronic lower respiratory diseases section. As a principal diagnosis it groups to MS-DRG 202 Bronchitis and Asthma with CC/MCC, MS-DRG 203 Bronchitis and Asthma without CC/MCC (MDC 04 MDC 04: Diseases and Disorders of the Respiratory System). 11 LCD billing and coding articles list it as covered.

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); IPPS Table 5 (MS-DRG weights): v44 FY2027 (final rule + CN3) (effective October 1, 2026); ICD-10-CM to HCC mapping: PY2027 initial ICD-10-CM mappings (dates of service 2026) (payment year 2027); Medicare Coverage Database billing and coding articles: MCD release October 8, 2026 (effective October 4, 2026). Next CMS release: FY2028 code files, effective October 1, 2027 for the ICD-10-CM code descriptions; FY2028 final rule (August 2027), effective October 1, 2027; an April 1 interim grouper update when CMS issues one for the IPPS Table 5 (MS-DRG weights); PY2028 advance notice (February 2027) and the PY2027 midyear final mapping (spring 2027) for the ICD-10-CM to HCC mapping; weekly, every Thursday for the Medicare Coverage Database billing and coding articles.

Code
J45.990
billable FY2027 ICD-10-CM code
Category
J45 Asthma
Chapter
10: Diseases of the respiratory system (J00-J99)
CC/MCC (MS-DRG v44)
Neither
CMS-HCC V28
Not mapped
POA reporting
Required

Tabular list notes for J45.990

The tabular list has no notes on J45.990 itself; the notes below apply from its parent headings.

Inherited from J45 (Asthma)

Includes
  • allergic (predominantly) asthma
  • allergic bronchitis NOS
  • allergic rhinitis with asthma
  • atopic asthma
  • extrinsic allergic asthma
  • hay fever with asthma
  • idiosyncratic asthma
  • intrinsic nonallergic asthma
  • nonallergic asthma
Excludes1 (never coded together)
  • detergent asthma (J69.8)
  • miner's asthma (J60)
  • wheezing NOS (R06.2)
  • wood asthma (J67.8)
Excludes2 (not part of this condition, may be coded together)
  • asthma with chronic obstructive pulmonary disease (J44.89)
  • chronic asthmatic (obstructive) bronchitis (J44.89)
  • chronic obstructive asthma (J44.89)
  • other specified chronic obstructive pulmonary disease (J44.89)
Use additional code
  • 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)
  • tobacco dependence (F17.-)
  • tobacco use (Z72.0)

MS-DRG grouping when J45.990 is the principal diagnosis

MS-DRG v44 groups for J45.990 as principal diagnosis
MDCMS-DRGs
04 MDC 04: Diseases and Disorders of the Respiratory System202203

The final group also depends on procedures, secondary diagnoses and discharge status; the MS-DRG lookup for J45.990 shows the full grouping logic.

CC/MCC status and inpatient edits

J45.990 is neither a CC nor an MCC under MS-DRG v44, so as a secondary diagnosis it does not raise the MS-DRG severity level. Check J45.990 against a principal diagnosis.

  • Present on admission: a POA indicator is required on inpatient claims.

CMS-HCC V28 risk adjustment

J45.990 does not map to a payment HCC in the PY2027 CMS-HCC V28 model, so on its own it does not change a Medicare Advantage risk score.

LCD billing and coding articles that list J45.990

11 current Medicare billing and coding articles list J45.990 among the diagnoses that support medical necessity for the services they cover.

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Frequently asked questions

What does ICD-10-CM J45.990 mean?

J45.990 means exercise induced bronchospasm. It is one of 18 billable codes under J45, asthma.

Which MS-DRG does J45.990 group to?

As the principal diagnosis, J45.990 groups to MS-DRG 202 Bronchitis and Asthma with CC/MCC, MS-DRG 203 Bronchitis and Asthma without CC/MCC (MDC 04 MDC 04: Diseases and Disorders of the Respiratory System) under MS-DRG v44, before procedures and secondary diagnoses are applied.

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 descriptor and notes are reproduced from the FY2027 ICD-10-CM files; MS-DRG, CC/MCC and HCC facts come from the CMS FY2027 and PY2027 tables. Code from the medical record and 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.