J40-J4B — Chronic lower respiratory diseases
Codes in range
40
No clinical group
0
A period cannot be grouped from these.
Barred as primary
0
CMS rejects these in the primary position.
Where these codes group
39 of the 40 codes in J40-J4B group to MMTA - Respiratory, but the range is not uniform — it spreads across 2 clinical groups. Every code here is assigned a group.
Code families in J40-J4B
One page per three-character family: every code in it, whether it can lead a claim, its clinical group and comorbidity subgroup.
- J40Bronchitis, not specified as acute or chronic1 code
- J41Simple and mucopurulent chronic bronchitis3 codes
- J42Unspecified chronic bronchitis1 code
- J43Emphysema5 codes
- J44Other chronic obstructive pulmonary disease5 codes
- J4AChronic lung allograft dysfunction3 codes
- J4BPulmonary mycetoma1 code
- J45Asthma18 codes
- J47Bronchiectasis3 codes
Every code in J40-J4B
Descriptions are CMS’s own, abbreviated as CMS abbreviates them.
| Code | Description | Clinical group | Primary position |
|---|---|---|---|
| J40 | Bronchitis, not specified as acute or chronic | L | Can lead a claim |
| J410 | Simple chronic bronchitis | L | Can lead a claim |
| J411 | Mucopurulent chronic bronchitis | L | Can lead a claim |
| J418 | Mixed simple and mucopurulent chronic bronchitis | L | Can lead a claim |
| J42 | Unspecified chronic bronchitis | L | Can lead a claim |
| J430 | Unilateral pulmonary emphysema [MacLeod's syndrome] | L | Can lead a claim |
| J431 | Panlobular emphysema | L | Can lead a claim |
| J432 | Centrilobular emphysema | L | Can lead a claim |
| J438 | Other emphysema | L | Can lead a claim |
| J439 | Emphysema, unspecified | L | Can lead a claim |
| J440 | Chr obstructive pulmon disease with (acute) lower resp infct | L | Can lead a claim |
| J441 | Chronic obstructive pulmonary disease w (acute) exacerbation | L | Can lead a claim |
| J4481 | Bronchiolitis obliterans and bronchiolitis obliterans synd | L | Can lead a claim, code first applies |
| J4489 | Other specified chronic obstructive pulmonary disease | L | Can lead a claim |
| J449 | Chronic obstructive pulmonary disease, unspecified | L | Can lead a claim |
| J4520 | Mild intermittent asthma, uncomplicated | L | Can lead a claim |
| J4521 | Mild intermittent asthma with (acute) exacerbation | L | Can lead a claim |
| J4522 | Mild intermittent asthma with status asthmaticus | L | Can lead a claim |
| J4530 | Mild persistent asthma, uncomplicated | L | Can lead a claim |
| J4531 | Mild persistent asthma with (acute) exacerbation | L | Can lead a claim |
| J4532 | Mild persistent asthma with status asthmaticus | L | Can lead a claim |
| J4540 | Moderate persistent asthma, uncomplicated | L | Can lead a claim |
| J4541 | Moderate persistent asthma with (acute) exacerbation | L | Can lead a claim |
| J4542 | Moderate persistent asthma with status asthmaticus | L | Can lead a claim |
| J4550 | Severe persistent asthma, uncomplicated | L | Can lead a claim |
| J4551 | Severe persistent asthma with (acute) exacerbation | L | Can lead a claim |
| J4552 | Severe persistent asthma with status asthmaticus | L | Can lead a claim |
| J45901 | Unspecified asthma with (acute) exacerbation | L | Can lead a claim |
| J45902 | Unspecified asthma with status asthmaticus | L | Can lead a claim |
| J45909 | Unspecified asthma, uncomplicated | L | Can lead a claim |
| J45990 | Exercise induced bronchospasm | L | Can lead a claim |
| J45991 | Cough variant asthma | L | Can lead a claim |
| J45998 | Other asthma | L | Can lead a claim |
| J470 | Bronchiectasis with acute lower respiratory infection | L | Can lead a claim |
| J471 | Bronchiectasis with (acute) exacerbation | L | Can lead a claim |
| J479 | Bronchiectasis, uncomplicated | L | Can lead a claim |
| J4A0 | Restrictive allograft syndrome | L | Can lead a claim, code first applies |
| J4A8 | Other chronic lung allograft dysfunction | L | Can lead a claim, code first applies |
| J4A9 | Chronic lung allograft dysfunction, unspecified | L | Can lead a claim, code first applies |
| J4B | Pulmonary mycetoma | K | Can lead a claim |
Source: CMS HH PPS Grouper Software v07.2.26, effective 2026-10-01. This is the crosswalk Medicare runs a claim through. Grouping also depends on admission source, timing, the OASIS functional items and the rest of the diagnosis list.