J43.9 ICD-10-CM Code: Emphysema, unspecified

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for J43.9 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2026Effective: October 1, 2025

Notes without a marker are published on J43.9 itself; “inherited from” names the category or block whose note applies here.

Coder workflow for J43.9

MedCoder structured workflow — derived from this code’s own official record

Before you code J43.9

1. Unspecified does not mean incorrect. When the record gives no greater specificity, J43.9 may be the appropriate code. Check the record for detail that supports a more specific sibling. An unspecified code is for records that do not provide the detail a more specific code needs; a query, not an assumption, is the route to specificity (Guidelines I.A.9.b, I.B.18).

   ReviewJ43.0, J43.1, J43.2, J43.8

   See the relationships section · Guide: Other vs unspecified (NEC vs NOS) →

2. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with J43.9. Excludes1 conditions are not reported together with this code unless the record shows they are unrelated (Guidelines I.A.12.a).

   See the official tabular notes

Choose the right path

1. Does the record document the detail a more specific sibling code needs?
   Yes → Review the specific siblings in this subcategory.
   No → Continue — J43.9 is appropriate when the documentation goes no further.

   ReviewJ43.0, J43.1, J43.2, J43.8

2. Does the documentation support a condition named in J43.9’s Excludes1 note?
   Yes → Do not simply proceed: review the excluded code. Both are reported only when the record shows the two conditions are unrelated.
   No → Continue.

   ReviewJ98.3, J98.2, P25.0, T81.82, J68.0

Consider J43.9. Then confirm the code is valid for the date of service in the Verify section.

Documentation check

The provider’s diagnostic statement

Codes are assigned from the provider’s documented diagnosis, not from clinical criteria, test values or a medication list (Guidelines I.A.19).

Any detail beyond this code’s title

What the record states that a more specific sibling code would capture — or its absence, which itself supports the unspecified code.

Official instructions as workflow

• Excludes1 — check before selecting J43.9(6 notes)

  Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with J43.9: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

  CompareJ98.3, J98.2, P25.0, T81.82, J68.0

  See the official tabular notes · Guidelines I.A.12.a

• Excludes2 — not part of J43.9(5 notes)

  Coding workflow: The conditions named in this note are not included in J43.9. When the record documents both, both may be reported; the note is a boundary, not a prohibition.

  CompareJ68.4, J44, T79.7, E84

  See the official tabular notes · Guidelines I.A.12.b

Coding decision scenarios

Pattern scenarios for this code’s structure — decision rules, not clinical cases

Every row is derived from this code’s own record — its title, tabular notes, 7th-character family and same-category siblings — with fixed MedCoder wording; nothing is inferred about a patient. The official notes and guideline text are in the sections each row links to, and they control.

Indexed Clinical Terms (8)

Official source data — entries quoted as published, in the Index’s own lookup phrasing

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code. These are alphabetic-index entries shown as the Index writes them — lookup phrasing, not necessarily the wording of a final diagnosis.

• Bleb (s), emphysematous (lung) (solitary)
• Bleb (s), lung (ruptured)
• Bleb (s), subpleural (emphysematous)
• Bulla (e), lung (emphysematous) (solitary)
• Cyst (colloid) (mucous) (simple) (retention), lung, giant bullous
• Disease, diseased, lung, obstructive (chronic), with, emphysema
• Emphysema (atrophic) (bullous) (chronic) (interlobular) (lung) (obstructive) (pulmonary) (senile) (vesicular)
• Obstruction, obstructed, obstructive, airway, with, emphysema

Don’t confuse J43.9 with…

MedCoder analysis — pairs from this code’s official notes, distinctions written by MedCoder

The codes most likely to be picked instead of J43.9 — named in its own official notes, or sharing its laterality or encounter family — with what separates them and which documentation moves the case. Each links to the full comparison.

• J98.3— Excludes1 conflict (Excludes1 — generally not reported together)

  Not coded here — the tabular list excludes this pair for the same encounter.

  Not reported together with this code, except where the two conditions are documented as unrelated.

  What moves you there: Documentation of compensatory emphysema moves the case to J98.3; the two are not reported together unless documented as unrelated.

  Full comparison: J43.9 vs J98.3 →

• J98.2— Excludes1 conflict (Excludes1 — generally not reported together)

  Not coded here — the tabular list excludes this pair for the same encounter.

  Not reported together with this code, except where the two conditions are documented as unrelated.

  What moves you there: Documentation of interstitial emphysema moves the case to J98.2; the two are not reported together unless documented as unrelated.

  Full comparison: J43.9 vs J98.2 →

• P25.0— Excludes1 conflict (Excludes1 — generally not reported together)

  Not coded here — the tabular list excludes this pair for the same encounter.

  Not reported together with this code, except where the two conditions are documented as unrelated.

  What moves you there: Documentation of neonatal interstitial emphysema moves the case to P25.0; the two are not reported together unless documented as unrelated.

  Full comparison: J43.9 vs P25.0 →

• T81.82— Excludes1 conflict (Excludes1 — generally not reported together)

  Not coded here — the tabular list excludes this pair for the same encounter.

  Not reported together with this code, except where the two conditions are documented as unrelated.

  What moves you there: Documentation of surgical (subcutaneous) emphysema moves the case to T81.82; the two are not reported together unless documented as unrelated.

  Full comparison: J43.9 vs T81.82 →

• J68.0— Excludes1 conflict (Excludes1 — generally not reported together)

  Not coded here — the tabular list excludes this pair for the same encounter.

  Not reported together with this code, except where the two conditions are documented as unrelated.

  What moves you there: Documentation of bronchitis due to chemicals, gases, fumes and vapors moves the case to J68.0; the two are not reported together unless documented as unrelated.

  Full comparison: J43.9 vs J68.0 →

• J68.4— Excludes2 relationship (Informational)

  Distinct conditions — both may be reported.

  A distinct condition — both may be reported when both are documented.

  What moves you there: Documentation of emphysema due to inhalation of chemicals, gases, fumes or vapors adds J68.4; it is not part of this code and both may be reported when both are documented.

  Full comparison: J43.9 vs J68.4 →

Relationships are read from this code's own official notes, its laterality siblings and its encounter family; the wording of each distinction is MedCoder editorial, and the documentation named in each “what moves you there” line is the official note phrase or sibling title itself. Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a.

Verify Before Coding

• No Medicare Code Editor or MS-DRG Definitions Manual restrictions apply to this code.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

MedCoder structured relationships — computed from published CMS and AHRQ datasets

Other codes that name J43.9 or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 1 Excludes1 note: J98.2 — Interstitial emphysema.

These codes’ tabular lists mark this diagnosis as mutually exclusive — not reported together unless the conditions are documented as unrelated.

Referenced by 1 Excludes2 note: J44 — Other chronic obstructive pulmonary disease (via J43.-).

These codes’ tabular lists name this diagnosis as distinct — both may be reported when both are documented.

Referenced by 1 Code Also instruction: J68.4 — Chronic respiratory conditions due to chemicals, gases, fumes and vapors (via J43.-).

These codes suggest coding this condition alongside when both are present.

MS-DRG Grouper Relationships (FY2026)

Potential MS-DRG participation — not a DRG assignment.

FY2026 MS-DRG: not on the CMS CC/MCC list — as a secondary diagnosis this code does not change MS-DRG severity for that release.

Named in the grouper logic of 3 MS-DRGs: DRG 190 (MDC 04), DRG 191 (MDC 04), DRG 192 (MDC 04).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Clinical classification (AHRQ CCSR):RSP008 — Chronic obstructive pulmonary disease and bronchiectasis (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Related Codes

Same CMS-HCC risk category (V28)

CMS maps these diagnoses to the same Hierarchical Condition Category (Chronic Obstructive Pulmonary Disease, Interstitial Lung Disorders, and Other Chronic Lung Disorders) for risk-adjusted payment.

B44.81 — Allergic bronchopulmonary aspergillosis, J41.0 — Simple chronic bronchitis, J41.1 — Mucopurulent chronic bronchitis, J41.8 — Mixed simple and mucopurulent chronic bronchitis, J42 — Unspecified chronic bronchitis, J43.0 — Unilateral pulmonary emphysema [MacLeod's syndrome], J43.1 — Panlobular emphysema, J43.2 — Centrilobular emphysema, J43.8 — Other emphysema, 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, J44.9 — Chronic obstructive pulmonary disease, unspecified, J47.0 — Bronchiectasis with acute lower respiratory infection, J47.1 — Bronchiectasis with (acute) exacerbation, J47.9 — Bronchiectasis, uncomplicated, J60 — Coalworker's pneumoconiosis, J61 — Pneumoconiosis due to asbestos and other mineral fibers, J62.0 — Pneumoconiosis due to talc dust, +58 more

Related risk categories

These categories interact through CMS's HCC hierarchy — one can suppress the other's risk-adjustment weight when both are present on a claim.

Lung Transplant Status/Complications, Cystic Fibrosis, Idiopathic Pulmonary Fibrosis and Lung Involvement in Systemic Sclerosis, Severe Persistent Asthma

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Chronic obstructive pulmonary disease and bronchiectasis).

J41.0 — Simple chronic bronchitis, J41.1 — Mucopurulent chronic bronchitis, J41.8 — Mixed simple and mucopurulent chronic bronchitis, J42 — Unspecified chronic bronchitis, J43.0 — Unilateral pulmonary emphysema [MacLeod's syndrome], J43.1 — Panlobular emphysema, J43.2 — Centrilobular emphysema, J43.8 — Other emphysema, 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, J44.9 — Chronic obstructive pulmonary disease, unspecified, J47.0 — Bronchiectasis with acute lower respiratory infection, J47.1 — Bronchiectasis with (acute) exacerbation, J47.9 — Bronchiectasis, uncomplicated, J4A.8 — Other chronic lung allograft dysfunction, J4A.9 — Chronic lung allograft dysfunction, unspecified

Same Index main term, other category

The ICD-10-CM Index to Diseases and Injuries files this code under the main terms “Obstruction, obstructed, obstructive”, “Cyst”, “Emphysema”; these codes share that main term but sit in a different category of the Tabular List.

I89.8 — Other specified noninfective disorders of lymphatic vessels and lymph nodes (peritoneum, chylous), I99.8 — Other disorder of circulatory system (vessel NEC), J34.1 — Cyst and mucocele of nose and nasal sinus (nose), J34.89 — Other specified disorders of nose and nasal sinuses (nose), J35.8 — Other chronic diseases of tonsils and adenoids (tonsil), J38.5 — Laryngeal spasm (airway, due to, laryngospasm), J38.6 — Stenosis of larynx (larynx NEC), J38.7 — Other diseases of larynx (larynx), J39.2 — Other diseases of pharynx (pharynx), J39.8 — Other specified diseases of upper respiratory tract (trachea), J44.89 — Other specified chronic obstructive pulmonary disease (airway, with, bronchitis), J44.9 — Chronic obstructive pulmonary disease, unspecified (airway, chronic), J45.901 — Unspecified asthma with (acute) exacerbation (airway, with, asthma, with, exacerbation), J45.902 — Unspecified asthma with status asthmaticus (airway, with, asthma, with, status asthmaticus), J45.909 — Unspecified asthma, uncomplicated (airway, with, asthma), J47.0 — Bronchiectasis with acute lower respiratory infection (airway, with, bronchiectasis, with, lower respiratory infection), J47.1 — Bronchiectasis with (acute) exacerbation (airway, with, bronchiectasis, with, exacerbation), J47.9 — Bronchiectasis, uncomplicated (airway, with, bronchiectasis), J67.9 — Hypersensitivity pneumonitis due to unspecified organic dust (airway, with, allergic alveolitis), J68.9 — Unspecified respiratory condition due to chemicals, gases, fumes and vapors (airway, due to, inhalation of fumes or vapors), +323 more

Contextual Map

Every relationship of J43.9 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Run J43.9 with these 3 related codes in Claim Check

Hierarchy

• J00-J99 — Chapter 10: Diseases of the Respiratory System (J00-J99) (J00-J99)[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• J40-J4A — Chronic lower respiratory diseases[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026

Referenced by Excludes1 notes

• J98.2 — Interstitial emphysema[Excludes1]: “emphysema NOS (J43.9)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Referenced by Excludes2 notes

• J44 — Other chronic obstructive pulmonary disease[Excludes2](via J43.-): “emphysema without chronic bronchitis (J43.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Referenced by Code Also instructions

• J68.4 — Chronic respiratory conditions due to chemicals, gases, fumes and vapors[Code Also](via J43.-): “emphysema (J43.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Clinical classification (CCSR)

• RSP008 — Chronic obstructive pulmonary disease and bronchiectasis[CCSR]— AHRQ CCSR for ICD-10-CM Diagnoses (HCUP)

Risk adjustment (CMS-HCC)

• HCC 280 — Chronic Obstructive Pulmonary Disease, Interstitial Lung Disorders, and Other Chronic Lung Disorders [CMS-HCC]— CMS-HCC V28 · 2026

MS-DRG Grouper

• DRG 190 — CHRONIC OBSTRUCTIVE PULMONARY DISEASE WITH MCC[MS-DRG]: “CHRONIC OBSTRUCTIVE PULMONARY DISEASE WITH MCC (MDC 04)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 191 — CHRONIC OBSTRUCTIVE PULMONARY DISEASE WITH CC[MS-DRG]: “CHRONIC OBSTRUCTIVE PULMONARY DISEASE WITH CC (MDC 04)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 192 — CHRONIC OBSTRUCTIVE PULMONARY DISEASE WITHOUT CC/MCC[MS-DRG]: “CHRONIC OBSTRUCTIVE PULMONARY DISEASE WITHOUT CC/MCC (MDC 04)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026

MDC crossing

• MDC 04 — Diseases and Disorders of the Respiratory System[MDC crossing]: “Diseases and Disorders of the Respiratory System — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs. 3,998 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2026

Index entries

• Bleb (s), emphysematous (lung) (solitary)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Bleb (s), lung (ruptured)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Bleb (s), subpleural (emphysematous)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Bulla (e), lung (emphysematous) (solitary)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Cyst (colloid) (mucous) (simple) (retention), lung, giant bullous[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Disease, diseased, lung, obstructive (chronic), with, emphysema[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Emphysema (atrophic) (bullous) (chronic) (interlobular) (lung) (obstructive) (pulmonary) (senile) (vesicular)[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026
• Obstruction, obstructed, obstructive, airway, with, emphysema[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026

Nearest codes

• J43 — Emphysema[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• J43.0 — Unilateral pulmonary emphysema [MacLeod's syndrome][Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• J43.1 — Panlobular emphysema[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• J43.2 — Centrilobular emphysema[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• J43.8 — Other emphysema[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026

Change history

• FY2016 — In the code set at ICD-10-CM adoption [Change history]— CMS release files (code change ledger) · icd10cm-fy2016

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data

CMS/CDC ICD-10-CM FY2026 tabular list, index and tables, effective October 1, 2025 Release, file and checksum · Publisher’s page

Claim edits Official source data

CMS Definitions of Medicare Code Edits — v43.1 (April 2026) Release, file and checksum · Publisher’s page

Inpatient payment groups Official source data

CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v43 Release, file and checksum · Publisher’s page

Risk adjustment Official source data

2026 Mid-Year Final ICD-10 Mappings + Model Software (cms.gov/files/zip/2026-midyear-final-icd-10-mappings.zip, 2026-midyear-final-model-software.zip) — CMS-HCC V28, PY2026 mid-year final release Release, file and checksum · Publisher’s page

Change history and date-of-service validity Official source data

CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page

Comparisons, relationships and the contextual map MedCoder structured relationship

Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears

Summary and FAQ answers MedCoder explanation

Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Labels on this page: Official source data · MedCoder structured relationship · MedCoder explanation. How to read the labels · All data sources and release dates

Nearest Codes in This Family

Official ICD-10-CM classifications closest to J43.9 in its code family, with their registry titles.

• J43 — Emphysema
• J43.0 — Unilateral pulmonary emphysema [MacLeod's syndrome]
• J43.1 — Panlobular emphysema
• J43.2 — Centrilobular emphysema
• J43.8 — Other emphysema

View all codes in the J43 family