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 CMSESRD
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 CMSCMS-HCC V24
Not published by CMSESRD
Not published by CMSRxHCC
Not published by CMSPACE (CMS-HCC V22 component)
Not published by CMSPACE ESRD (ESRD V21 component)
Not published by CMSPACE RxHCC component
Not published by CMSOct to Dec 2026, BY2026
HHS-HCC
PendingJan to Sep 2027, BY2027
HHS-HCC
Not published by CMSFY2027 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).
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
