J44.9: Chronic obstructive pulmonary disease, unspecified

The ICD-10-CM code for COPD when the encounter documentation does not specify an acute infection, an exacerbation, or another specified type such as bronchiolitis obliterans.

Billable

FY2027

TABLE OF CONTENTS

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At a glance

Code Family

J44: Other chronic obstructive pulmonary disease.

DRG Grouping

MS-DRG 190, 191 or 192 under the FY2027 MS-DRG v44 grouper, depending on complications and comorbidities.

HCC Mapping (v28)

HCC 280: Chronic Obstructive Pulmonary Disease, Interstitial Lung Disorders, and Other Chronic Lung Disorders.

Condition

COPD

Family Specificity

Five billable codes structured around the acuity of the current clinical presentation, with J44.9 as the residual code for stable or unspecified COPD.

Which J44 code do I assign?

The J44 family splits on what is happening at this encounter rather than on how severe the underlying disease is. Match the child code to the acuity the note documents, and reserve J44.9 for stable COPD or for COPD recorded without a stated acuity.

When documentation says…

Code

COPD patient admitted with pneumonia

J44.0

COPD with a concurrent acute lower respiratory tract infection such as pneumonia or acute bronchitis. The note must document both the COPD and the acute infection, and the infection is coded additionally.

Acute exacerbation of COPD

J44.1

An acute or acute-on-chronic exacerbation of COPD without a qualifying lower respiratory infection. The provider must explicitly document the exacerbation. If an acute lower respiratory infection is also present, J44.0 applies instead.

Bronchiolitis obliterans or bronchiolitis obliterans syndrome documented

J44.81

Bronchiolitis obliterans and bronchiolitis obliterans syndrome. Use when the provider documents either condition. Code first a transplant complication when applicable, such as lung transplant rejection (T86.810).

Chronic obstructive bronchitis, or asthma with COPD, documented

J44.89

Other specified chronic obstructive pulmonary disease. The Alphabetic Index assigns chronic obstructive bronchitis, chronic obstructive asthma and asthma with chronic obstructive pulmonary disease to this code.

Stable COPD, no acute exacerbation

J44.9

Stable COPD with no documented acute infection, exacerbation or other specified type, or COPD NOS when the clinical record does not specify. The note should state the acuity plainly, such as stable or no acute exacerbation, to support this selection.

Tabular notes

CODE ALSO

Code also the type of asthma (J45.-), if applicable. This note sits at category J44 and applies to J44.9. The Code also note that names J68.4 sits at J44.81, Bronchiolitis obliterans and bronchiolitis obliterans syndrome, and does not apply to J44.9.

USE ADDITIONAL

Chapter 10 carries a Use additional code note, where applicable, 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 tobacco use (Z72.0). Category J44 carries no Use additional note of its own.

EXCLUDES2

Category J44 carries Excludes2 notes for certain conditions that may co-exist with COPD. An Excludes2 note permits dual coding when both conditions are present and clinically appropriate. J44.9 carries its own Excludes2 note for lung diseases due to external agents (J60-J70). When occupational inhalation exposure is documented, J68.4 may be reported alongside J44.9 under that note.

FY2027: EFFECTIVE 1 OCTOBER 2026

No child codes were added to or deleted from category J44 in FY2026. The FY2027 codes and tabular addenda make no addition, deletion or revision in category J44. The FY2027 update adds J4B, pulmonary mycetoma, to the same block, which it renames J40-J4B. It also adds a Code also note at J42 for chronic respiratory conditions due to chemicals, gases, fumes and vapors (J68.4).

Operational & financial impact

Why specificity matters beyond the chart: risk adjustment, DRG assignment and denial exposure all follow from which code is selected.

CMS-HCC v28 (PY2024+)

HCC 280: Chronic Obstructive Pulmonary Disease, Interstitial Lung Disorders, and Other Chronic Lung Disorders.

CMS-HCC v28 is fully phased in at 100 percent as of 1 January 2026.

For Medicare Advantage risk adjustment, COPD must be documented as actively managed each calendar year, and the code must appear on a dated encounter note rather than only on a problem list.

MS-DRG v44 (FY2027)

MS-DRG 190: Chronic obstructive pulmonary disease with MCC.

MS-DRG 191: Chronic obstructive pulmonary disease with CC.

MS-DRG 192: Chronic obstructive pulmonary disease without CC/MCC.

Inpatient admissions with J44.9 as the principal diagnosis group to MS-DRG 190, 191 or 192 under the FY2027 MS-DRG v44 grouper, depending on the presence and severity of complications or comorbidities. As a secondary diagnosis, J44.9 carries no CC or MCC designation under MS-DRG v44, per CMS Tables 6I and 6J.

COVERAGE CONTEXT

COPD is covered under Medicare Part A and Part B for qualifying encounters. There is no National Coverage Determination specific to COPD diagnosis coding. For evaluation and management services, the COPD diagnosis supports the complexity of medical decision-making. These coding and risk adjustment rules apply to Medicare Fee-for-Service and to Medicare Advantage plans using CMS-HCC v28 for payment year 2026.

Documentation checklist to support J44.9

Chart elements that support code selection and reduce specificity-driven denials.

A diagnosis of COPD, whether chronic bronchitis, emphysema or combined COPD.

The absence of, or the lack of any documentation of, an acute exacerbation or a concurrent lower respiratory infection. If an exacerbation is documented, assign J44.1. If a concurrent acute lower respiratory infection is documented, assign J44.0 plus the infection code.

Tobacco exposure history or current status, to support the Use Additional codes.

Evidence of active clinical management, to support annual recapture under CMS-HCC v28.

Where occupational inhalant exposure is the documented etiology, the exposure detail needed to support J68.4 alongside J44.9.

For outpatient encounters, a confirmed diagnosis only: probable or suspected COPD is not coded in the outpatient setting. An uncertain diagnosis documented at discharge may be coded as confirmed on the inpatient side under UHDDS guidelines.

FAQ

When should I use J44.9 instead of J44.1?

Use J44.1 when the provider explicitly documents an acute exacerbation of COPD. Use J44.9 for stable COPD, or when the acuity is not specified in the note.

Does J44.9 still map to an HCC in 2026?

Yes. J44.9 maps to HCC 280, Chronic Obstructive Pulmonary Disease, Interstitial Lung Disorders, and Other Chronic Lung Disorders under CMS-HCC v28, which is fully operative at 100 percent for payment year 2026.

What is new about J44.9 in FY2027?

J44.9 is unchanged in the FY2027 update. No child codes were added to or deleted from category J44 in FY2026. The FY2027 codes and tabular addenda, effective 1 October 2026, make no addition, deletion or revision in category J44. Category J44 carries no Code also note for J68.4. J68.4, Chronic respiratory conditions due to chemicals, gases, fumes and vapors, may be reported alongside J44.9 under the Excludes2 note at J44.9 for lung diseases due to external agents (J60-J70).

Do I need to code tobacco use separately?

Yes. ICD-10-CM instructs coders to use an additional code from F17.- for tobacco dependence, Z72.0 for tobacco use, Z77.22 for environmental tobacco smoke exposure, or a related code, when documented.

Which J44.9 coding errors should I avoid?

Assigning J44.9 when the note documents an acute exacerbation, which calls for J44.1. Omitting the Use Additional code for tobacco dependence or exposure. Assigning J44.9 for emphysema alone, which the Index sends to J43.9. Category J44 carries an Excludes2 note for emphysema without chronic bronchitis (the J43 codes). Omitting J68.4 alongside J44.9 when occupational inhalant etiology is documented.

Related codes

Codes in the same family as J44.9. Only codes with a published page render as links.

Sibling codes in the J44 family

J44.0: Chronic obstructive pulmonary disease with (acute) lower respiratory infection.
J44.1: Chronic obstructive pulmonary disease with (acute) exacerbation.
J44.81: Bronchiolitis obliterans and bronchiolitis obliterans syndrome.
J44.89: Other specified chronic obstructive pulmonary disease.

Additional codes to consider

Codes outside the J44 family considered alongside J44.9.

Companion: code alongside when documented

J68.4: Chronic respiratory conditions due to chemicals, gases, fumes and vapors.
F17.2-: Nicotine dependence.
Z72.0: Tobacco use.
Z77.22: Contact with and (suspected) exposure to environmental tobacco smoke (acute) (chronic).
Z87.891: Personal history of nicotine dependence.
Z57.31: Occupational exposure to environmental tobacco smoke.

Consider instead

J43.9: Emphysema, unspecified, where there is no concurrent chronic bronchitis component.
J41.0: Simple chronic bronchitis, without emphysema.
J42: Unspecified chronic bronchitis.

Sources

All claims on this page derive from government and professional-standards sources.

National Center for Health Statistics. (2026). International classification of diseases, tenth revision, clinical modification (ICD-10-CM) FY2027 files. https://www.cdc.gov/nchs/icd/icd-10-cm/files.html
Centers for Medicare & Medicaid Services and National Center for Health Statistics. (2026). ICD-10-CM official guidelines for coding and reporting FY2027. https://ftp.cdc.gov/pub/Health_Statistics/NCHS/Publications/ICD10CM/2027/ICD-10-CM-October-1-2026-FY27-Guidelines.pdf
Centers for Medicare & Medicaid Services. (2025). 2026 model software/ICD-10 mappings. https://www.cms.gov/medicare/payment/medicare-advantage-rates-statistics/risk-adjustment/2026-model-software-icd-10-mappings
Centers for Medicare & Medicaid Services. (2026). MS-DRG classifications and software, version 44. https://www.cms.gov/medicare/payment/prospective-payment-systems/acute-inpatient-pps/ms-drg-classifications-and-software