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ICD-10-CM 2027 diagnosis code

J40Bronchitis, not specified as acute or chronic

✓ Billable / specific

J40 is a valid, billable ICD-10-CM code for bronchitis, not specified as acute or chronic. It can be reported on claims for dates of service from October 1, 2026 – September 30, 2027.

Looking up by condition? See ICD-10 code for Bronchitis, ICD-10 code for Catarrhal bronchitis.

Code unchanged since ICD-10-CM took effect on October 1, 2015. Source: official FY2027 ICD-10-CM release from CDC/NCHS and CMS. Page updated September 29, 2026. About our data

About J40

J40 is the ICD-10-CM diagnosis code for bronchitis, not specified as acute or chronic. It belongs to block J40-J4B (chronic lower respiratory diseases) and chapter 10 (diseases of the respiratory system). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Don't report J40 together with the conditions in its Excludes1 note: acute bronchitis (J20.-), allergic bronchitis NOS (J45.909), asthmatic bronchitis NOS (J45.9-) and bronchitis due to chemicals, gases, fumes and vapors (J68.0).

Use an additional code to identify: 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.-) and 1 more.

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

In MS-DRG v44.0, it is part of the grouping logic for DRG 202 (Bronchitis and Asthma with CC/MCC, relative weight 0.9474) and DRG 203 (Bronchitis and Asthma without CC/MCC, relative weight 0.6512), in MDC 04 (Diseases and Disorders of the Respiratory System), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 490 (bronchitis, not specified as acute or chronic).

Coding notes

Applicable toConditions and synonyms classified to this code
  • Bronchitis NOS
  • Bronchitis with tracheitis NOS
  • Catarrhal bronchitis
  • Tracheobronchitis NOS
Excludes1Not coded here — never report together with this code
  • acute bronchitis (J20.-)
  • allergic bronchitis NOS (J45.909)
  • asthmatic bronchitis NOS (J45.9-)
  • bronchitis due to chemicals, gases, fumes and vapors (J68.0)
Use additional codeAdd a secondary code to fully describe the condition
  • code to identify:
  • 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)

Notes that apply from higher levels

Instructions written at a parent level also apply to J40.

Broader instructions also apply from J40-J4B Chronic lower respiratory diseases and Chapter 10: Diseases of the respiratory system.

Alphabetic index entries

4 entries

Terms in the official ICD-10-CM index that lead to J40.

Codes whose notes reference J40

MS-DRG v44.0 grouping

All DRGs →

Inpatient MS-DRGs this diagnosis can group to, as the principal or a secondary diagnosis, depending on the rest of the claim.

ICD-9-CM equivalent

Converter →
  • 490Bronchitis, not specified as acute or chronicexact

From the CMS 2018 General Equivalence Mappings (GEMs), the final GEMs release.

Code history

  1. 2016
  2. 2017
  3. 2018
  4. 2019
  5. 2020
  6. 2021
  7. 2022
  8. 2023
  9. 2024
  10. 2025
  11. 2026
  12. 2027
  • FY2016 (effective 10/1/2015): Added (first year of ICD-10-CM)
  • No changes since FY2016.

Common questions about J40

Is J40 billable?

Yes. J40 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).

Can J40 be used as a principal diagnosis?

Yes. The Medicare Code Editor doesn't restrict J40 as a principal diagnosis.

Is J40 a CC or MCC?

No. J40 is neither a CC nor an MCC under MS-DRG v44.0.

What DRG does J40 group to?

J40 is used in the MS-DRG v44.0 logic for MS-DRG 202 (Bronchitis and Asthma with CC/MCC) and MS-DRG 203 (Bronchitis and Asthma without CC/MCC). Which one applies depends on whether it is the principal diagnosis and on the rest of the claim.

What is the ICD-9 code for J40?

The CMS General Equivalence Mappings map J40 to ICD-9-CM 490.