DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

J42 diagnosis code · Billable category · FY2027

J42 Unspecified chronic bronchitis

  • Billable
  • Not CC/MCC
  • HCC 280
  • POA reported

J42 ICD-10 code: a billable diagnosis code in FY2027; the category has no subdivisions.

Where it sits

  1. Chapter 10 Diseases of the respiratory system (J00-J99)
  2. J40-J4B Chronic lower respiratory diseases (J40-J4B)
  3. J42 Unspecified chronic bronchitis
CC / MCC
Neither
MS-DRG
190-192
HCC V28
280
POA
Reported
Code Editor
–
Index entries
11

Instructions

At J42

Inclusion terms

  • Chronic bronchitis NOS
  • Chronic tracheitis
  • Chronic tracheobronchitis

Excludes1

  • bronchiolitis obliterans and bronchiolitis obliterans syndrome (J44.81) J44.81
  • chronic asthmatic bronchitis (J44.-) J44
  • chronic bronchitis with airways obstruction (J44.-) J44
  • chronic emphysematous bronchitis (J44.-) J44
  • chronic obstructive pulmonary disease NOS (J44.9) J44.9
  • simple and mucopurulent chronic bronchitis (J41.-) J41

Use additional code

  • code to identify:
  • exposure to environmental tobacco smoke (Z77.22) Z77.22
  • exposure to tobacco smoke in the perinatal period (P96.81) P96.81
  • history of tobacco dependence (Z87.891) Z87.891
  • occupational exposure to environmental tobacco smoke (Z57.31) Z57.31
  • tobacco dependence (F17.-) F17
  • tobacco use (Z72.0) Z72.0

Code also

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

Notes that also apply

Block J40-J4B instructions (Excludes1 1, Excludes2 1): printed on the block page.

Chapter 10 instructions (Notes 1, Excludes2 9, Use additional code 7): printed on the chapter 10 page.

Index entries

  • Pharyngotracheitis, chronic → J42
  • Bronchitis (diffuse) (fibrinous) (hypostatic) (infective) (membranous)chronic → J42
  • Bronchitis (diffuse) (fibrinous) (hypostatic) (infective) (membranous)senile (chronic) → J42
  • Bronchorrheachronic (infective) (purulent) → J42
  • Infection, infected, infective (opportunistic)trachea, chronic → J42
  • Tracheitis (catarrhal) (infantile) (membranous) (plastic) (septal) (suppurative) (viral)chronic → J42
  • Tracheopharyngitis (acute)chronic → J42
  • Bronchitis (diffuse) (fibrinous) (hypostatic) (infective) (membranous)withtracheitis (l5 years of age and above)chronic → J42
  • Bronchitis (diffuse) (fibrinous) (hypostatic) (infective) (membranous)chronicwithtracheitis (chronic) → J42
  • Tracheitis (catarrhal) (infantile) (membranous) (plastic) (septal) (suppurative) (viral)withbronchitis (15 years of age and above)chronic → J42
  • Tracheitis (catarrhal) (infantile) (membranous) (plastic) (septal) (suppurative) (viral)chronicwithbronchitis (chronic) → J42

NCHS Alphabetic Index. Index first, then the Tabular List.

Medicare grouping and edits

CMS files for J42
CC / MCCNeither
Appendix BMDC 04 Diseases and Disorders of the Respiratory System, MS-DRG 190-192 (Chronic Obstructive Pulmonary Disease with MCC…)
Code Editor–
POAReported
HCC V28HCC 280 Chronic Obstructive Pulmonary Disease, Interstitial Lung Disorders, and Other Chronic Lung Disorders

CMS: MS-DRG v44 (Appendix B, C), MCE v44, POA list FY2027, 2027 Initial ICD-10-CM Mappings. What the rows mean.

Hierarchy