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FY2027 ICD-10-CM reference

J42: Unspecified chronic bronchitis

By the HCC Buddy Coding Team

The official ICD-10-CM descriptor is Unspecified chronic bronchitis. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.

Billable code. Verified against the official FY2027 order file.

Oct to Dec 2026, PY2027

CMS-HCC V28

Depends on member age or sex
  • HCC 280Chronic Obstructive Pulmonary Disease, Inters...Coefficient 0.319 (CNA, PY2027)
  • HCC 280 when age >= 18
  • No V28 HCC unless age >= 18
  • This code has a CMS age requirement: applies when age >= 18

CMS-HCC V24

Not used by CMS

ESRD

Depends on member age or sex
  • HCC 111Chronic Obstructive Pulmonary Disease
  • HCC 112Fibrosis of Lung and Other Chronic Lung Disor...

Candidates: the category depends on member age or sex

  • HCC 111: This code has a CMS age requirement: applies when age >= 18
  • HCC 112: This code has a CMS age requirement: applies when age < 18

RxHCC

Mapped
  • HCC 229Chronic Obstructive Pulmonary Disease, Bronch...Coefficient 0.17 (MA-PD CE non-low aged, PY2027)

PACE (CMS-HCC V22 component)

Depends on member age or sex
  • HCC 111Chronic Obstructive Pulmonary Disease
  • HCC 112Fibrosis of Lung and Other Chronic Lung Disor...

Candidates: the category depends on member age or sex

  • HCC 111: This code has a CMS age requirement: applies when age >= 18
  • HCC 112: This code has a CMS age requirement: applies when age < 18

PACE ESRD (ESRD V21 component)

Depends on member age or sex
  • HCC 111Chronic Obstructive Pulmonary Disease
  • HCC 112Fibrosis of Lung and Other Chronic Lung Disor...

Candidates: the category depends on member age or sex

  • HCC 111: This code has a CMS age requirement: applies when age >= 18
  • HCC 112: This code has a CMS age requirement: applies when age < 18

PACE RxHCC (2018/2019 component)

Mapped
  • HCC 229Chronic Obstructive Pulmonary Disease, Bronch...

Jan to Sep 2027, PY2028

CMS-HCC V28

Not published by CMS

CMS-HCC V24

Not published by CMS

ESRD

Not published by CMS

RxHCC

Not published by CMS

PACE (CMS-HCC V22 component)

Not published by CMS

PACE ESRD (ESRD V21 component)

Not published by CMS

PACE RxHCC component

Not published by CMS

Oct to Dec 2026, BY2026

HHS-HCC

Pending

Jan to Sep 2027, BY2027

HHS-HCC

Not published by CMS

FY2027 Tabular instructions

Instructions below include applicable chapter, section and parent-code notes. Each note identifies where it appears in the official source.

Instructional note

When a respiratory condition is described as occurring in more than one site and is not specifically indexed, it should be classified to the lower anatomic site (e.g. tracheobronchitis to bronchitis in J40).

Source: J00-J99 (chapter, inherited).

Instructional note

code, where applicable, to identify:

Source: J00-J99 (chapter, inherited).

Instructional note

exposure to environmental tobacco smoke (Z77.22)

Source: J00-J99 (chapter, inherited).

Instructional note

exposure to tobacco smoke in the perinatal period (P96.81)

Source: J00-J99 (chapter, inherited).

Instructional note

history of tobacco dependence (Z87.891)

Source: J00-J99 (chapter, inherited).

Instructional note

occupational exposure to environmental tobacco smoke (Z57.31)

Source: J00-J99 (chapter, inherited).

Instructional note

tobacco dependence (F17.-)

Source: J00-J99 (chapter, inherited).

Instructional note

tobacco use (Z72.0)

Source: J00-J99 (chapter, inherited).

Excludes2

certain conditions originating in the perinatal period (P04-P96)

Source: J00-J99 (chapter, inherited).

Excludes2

certain infectious and parasitic diseases (A00-B99)

Source: J00-J99 (chapter, inherited).

Excludes2

complications of pregnancy, childbirth and the puerperium (O00-O9A)

Source: J00-J99 (chapter, inherited).

Excludes2

congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)

Source: J00-J99 (chapter, inherited).

Excludes2

endocrine, nutritional and metabolic diseases (E00-E88)

Source: J00-J99 (chapter, inherited).

Excludes2

injury, poisoning and certain other consequences of external causes (S00-T88)

Source: J00-J99 (chapter, inherited).

Excludes2

neoplasms (C00-D49)

Source: J00-J99 (chapter, inherited).

Excludes2

smoke inhalation (T59.81-)

Source: J00-J99 (chapter, inherited).

Excludes2

symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Source: J00-J99 (chapter, inherited).

Excludes1

bronchitis due to chemicals, gases, fumes and vapors (J68.0)

Source: J40-J4B (section, inherited).

Excludes2

cystic fibrosis (E84.-)

Source: J40-J4B (section, inherited).

Instructional note

Chronic bronchitis NOS

Source: J42 (category, direct).

Instructional note

Chronic tracheitis

Source: J42 (category, direct).

Instructional note

Chronic tracheobronchitis

Source: J42 (category, direct).

Code also

, if applicable, chronic respiratory conditions due to chemicals, gases, fumes and vapors (J68.4)

Source: J42 (category, direct).

Instructional note

code to identify:

Source: J42 (category, direct).

Instructional note

exposure to environmental tobacco smoke (Z77.22)

Source: J42 (category, direct).

Instructional note

exposure to tobacco smoke in the perinatal period (P96.81)

Source: J42 (category, direct).

Instructional note

history of tobacco dependence (Z87.891)

Source: J42 (category, direct).

Instructional note

occupational exposure to environmental tobacco smoke (Z57.31)

Source: J42 (category, direct).

Instructional note

tobacco dependence (F17.-)

Source: J42 (category, direct).

Instructional note

tobacco use (Z72.0)

Source: J42 (category, direct).

Excludes1

bronchiolitis obliterans and bronchiolitis obliterans syndrome (J44.81)

Source: J42 (category, direct).

Excludes1

chronic asthmatic bronchitis (J44.-)

Source: J42 (category, direct).

Excludes1

chronic bronchitis with airways obstruction (J44.-)

Source: J42 (category, direct).

Excludes1

chronic emphysematous bronchitis (J44.-)

Source: J42 (category, direct).

Excludes1

chronic obstructive pulmonary disease NOS (J44.9)

Source: J42 (category, direct).

Excludes1

simple and mucopurulent chronic bronchitis (J41.-)

Source: J42 (category, direct).

Source: CMS FY2027 Tabular List and Alphabetic Index.

Open Tabular instructions and code details

Compare the FY2027 additions, removals and billable-status changes

What does J42 mean in FY2027?

The official ICD-10-CM descriptor is Unspecified chronic bronchitis. The FY2027 annual edition starts October 1, 2026. Check the edition that applies to the encounter or inpatient discharge, including any April update.

Is J42 billable in FY2027?

The FY2027 order file marks J42 as billable. Check the complete Tabular instructions and documentation before assigning it.

Does J42 map to an HCC?

Oct to Dec 2026, PY2027: CMS-HCC V28 depends on member age or sex: HCC 280 (Chronic Obstructive Pulmonary Disease, Interstitial Lung Disorders, and Other Chronic Lung Disorders) (This code has a CMS age requirement: applies when age >= 18); CMS-HCC V24: Not used by CMS; ESRD depends on member age or sex: HCC 111 (Chronic Obstructive Pulmonary Disease) and HCC 112 (Fibrosis of Lung and Other Chronic Lung Disorders) (HCC 111: This code has a CMS age requirement: applies when age >= 18; HCC 112: This code has a CMS age requirement: applies when age < 18); RxHCC HCC 229 (Chronic Obstructive Pulmonary Disease, Bronchiectasis, and Other Asthma). Jan to Sep 2027, PY2028: CMS-HCC V28: Not published by CMS; CMS-HCC V24: Not published by CMS; ESRD: Not published by CMS; RxHCC: Not published by CMS. Oct to Dec 2026, BY2026: HHS-HCC: Pending. Jan to Sep 2027, BY2027: HHS-HCC: Not published by CMS. Base coefficients are reference values, not a member total.

Source: CMS FY2027 ICD-10-CM order file. Payment model: CMS CY 2027 Rate Announcement. Read the FY2027 Official Guidelines.

Review the FY2026 April edition