J99 ICD-10-CM Code: Respiratory disorders in diseases classified elsewhere

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for J99 in the official ICD-10-CM tabular list, quoted as published.

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

This page already reflects the FY2027 tabular note taking effect October 1, 2026.

Coder workflow for J99

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

Before you code J99

1. J99 is a manifestation code (“in diseases classified elsewhere”). Confirm the underlying condition is documented and sequence it first; a manifestation code is not reported as the first-listed or principal diagnosis. The etiology/manifestation convention (Guidelines I.A.13).

   See the official tabular notes · Guide: Manifestation codes and Code First sequencing →

2. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with J99. 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 documentation support a condition named in J99’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.

   ReviewA06.5, B37.1, E84.0, M33.01, M33.11, A52.72

2. Is the underlying (etiologic) condition the Code First note names documented?
   Yes → Sequence the underlying condition first, then J99.
   No → A manifestation code needs its underlying condition — query before reporting it.

   ReviewE85, M45, A50, D89.1, A50.0, E88.02

Consider J99. 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).

The underlying (etiologic) condition

Named in the Code First note; sequenced before this code when documented (Guidelines I.A.13).

Official instructions as workflow

• Excludes1 — check before selecting J99(14 notes)

  Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with J99: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

  CompareA06.5, B37.1, E84.0, M33.01, M33.11, A52.72

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

• Code First — sequencing check(9 notes)

  Coding workflow: Check whether the underlying or etiologic condition the note names is documented. When it is, sequence it before J99. Do not add an underlying condition the record does not document.

  ReviewE85, M45, A50, D89.1, A50.0, E88.02

  See the official tabular notes · Guidelines I.A.13

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.

Coding Notes

MedCoder editorial — not official ICD-10-CM text; reviewed against the cited source

What this code means

J99 is the manifestation code for a respiratory disorder that is a direct expression of a systemic disease classified in another chapter. Its Code First list is short and specific: amyloidosis, ankylosing spondylitis, congenital syphilis, cryoglobulinemia, plasminogen deficiency, schistosomiasis, and bronchomycosis. Like F02, it is a manifestation code — it never stands alone, and the record must name the underlying disease for it to apply. A separate and longer Excludes1 list sends many other systemic diseases, including lupus, Sjögren syndrome, systemic sclerosis, dermatomyositis and the named fungal infections, to their own dedicated codes instead, so the specific disease documented decides whether J99 is in play at all.

Coding guidance

• Sequence the underlying disease first. The Code First note lists it: amyloidosis (E85.-), ankylosing spondylitis (M45.-), congenital syphilis (A50.-), cryoglobulinemia (D89.1), plasminogen deficiency (E88.02), schistosomiasis (B65.0-B65.9), bronchomycosis (B49) — J99 follows whichever of these the record names.
• The Medicare Code Editor carries J99 on its manifestation-code list, which requires the underlying condition (etiology) to be sequenced first — so J99 cannot stand as the principal diagnosis on an inpatient claim. That is a different MCE edit from the unacceptable-principal-diagnosis list, though the practical effect on sequencing is the same.
• A separate list of respiratory disorders in specific infections is Excludes1, not Code First: amebiasis, candidiasis, late syphilis, dermatomyositis, polymyositis, Sjögren syndrome, systemic lupus erythematosus, and Wegener’s granulomatosis each route to their own combination code elsewhere in the tabular rather than pairing with J99.
• When the record names one of the Excludes1 diseases, look for that disease’s own respiratory-manifestation combination code instead of reaching for J99 — the classification already built a dedicated code for that pairing.

Decision-rule scenarios

Scenarios state the decision rule, not a code assignment — code selection always follows the provider's documentation and the ICD-10-CM Official Guidelines.

Documentation checklist

• The specific underlying disease, named precisely enough to match either the Code First list or the Excludes1 list.
• That the respiratory finding is attributed to that disease, not an incidental or separately caused condition.

Codes are assigned from provider documentation; a coder never infers a diagnosis.

Common mistakes

• Reporting J99 without the underlying disease coded first.
• Using J99 as a principal diagnosis on an inpatient claim — the MCE manifestation edit requires the etiology first.
• Reaching for J99 when the documented disease is actually on the Excludes1 list (lupus, Sjögren’s, dermatomyositis, polymyositis, Wegener’s, the fungal infections, amebiasis, candidiasis, late syphilis) — those route to their own dedicated combination codes instead.

Written and reviewed by MedCoder against the official ICD-10-CM files; educational, not medical or billing advice. The official tabular notes and guidelines above take precedence in every case.

Don’t confuse J99 with…

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

The codes most likely to be picked instead of J99 — 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.

• A06.5— 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 amebiasis moves the case to A06.5; the two are not reported together unless documented as unrelated.

  Full comparison: J99 vs A06.5 →

• B40.0— 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 blastomycosis moves the case to B40.0; the two are not reported together unless documented as unrelated.

  Full comparison: J99 vs B40.0 →

• B40.2— 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 blastomycosis moves the case to B40.2; the two are not reported together unless documented as unrelated.

  Full comparison: J99 vs B40.2 →

• B37.1— 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 candidiasis moves the case to B37.1; the two are not reported together unless documented as unrelated.

  Full comparison: J99 vs B37.1 →

• B38.0— 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 coccidioidomycosis moves the case to B38.0; the two are not reported together unless documented as unrelated.

  Full comparison: J99 vs B38.0 →

• B38.2— 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 coccidioidomycosis moves the case to B38.2; the two are not reported together unless documented as unrelated.

  Full comparison: J99 vs B38.2 →

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

• Principal-diagnosis restriction. This is a manifestation code: the Medicare Code Editor requires the underlying condition (etiology) to be sequenced first, with this code reported after it.

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 J99 or its code family, from the CMS ICD-10-CM tabular instructional notes and the CMS ICD-10-CM Index to Diseases and Injuries. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 1 Use Additional Code instruction: E88.02 — Plasminogen deficiency.

These codes instruct coders to additionally report this code when it applies.

Referenced by 1 Index etiology/manifestation pair: B67.99 — Other echinococcosis.

The ICD-10-CM Index lists these etiology codes with this code in brackets — the manifestation, reported second.

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 196 (MDC 04), DRG 197 (MDC 04), DRG 198 (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):RSP016 — Other specified and unspecified lower respiratory disease.

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

Related Codes

Principal diagnosis restriction (Medicare Code Editor)

Manifestation code — the underlying condition is sequenced first.

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.

J84.111 — Idiopathic interstitial pneumonia, not otherwise specified, J84.113 — Idiopathic non-specific interstitial pneumonitis, J84.114 — Acute interstitial pneumonitis, J84.115 — Respiratory bronchiolitis interstitial lung disease, J84.116 — Cryptogenic organizing pneumonia, J84.117 — Desquamative interstitial pneumonia, J84.178 — Other interstitial pulmonary diseases with fibrosis in diseases classified elsewhere, J84.2 — Lymphoid interstitial pneumonia, J84.81 — Lymphangioleiomyomatosis, J84.82 — Adult pulmonary Langerhans cell histiocytosis, J84.89 — Other specified interstitial pulmonary diseases, J84.9 — Interstitial pulmonary disease, unspecified, J98.2 — Interstitial emphysema, J98.3 — Compensatory emphysema, M32.13 — Lung involvement in systemic lupus erythematosus, M33.01 — Juvenile dermatomyositis with respiratory involvement, M33.11 — Other dermatomyositis with respiratory involvement, M33.21 — Polymyositis with respiratory involvement, M33.91 — Dermatopolymyositis, unspecified with respiratory involvement, M35.02 — Sjögren syndrome with lung involvement, +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 (Other specified and unspecified lower respiratory disease).

J84.848 — Other interstitial lung diseases of childhood, J84.89 — Other specified interstitial pulmonary diseases, J84.9 — Interstitial pulmonary disease, unspecified, J85.2 — Abscess of lung without pneumonia, J98.01 — Acute bronchospasm, J98.09 — Other diseases of bronchus, not elsewhere classified, J98.4 — Other disorders of lung, J98.6 — Disorders of diaphragm, J98.8 — Other specified respiratory disorders, J98.9 — Respiratory disorder, unspecified, M05.10 — Rheumatoid lung disease with rheumatoid arthritis of unspecified site, M05.111 — Rheumatoid lung disease with rheumatoid arthritis of right shoulder, M05.112 — Rheumatoid lung disease with rheumatoid arthritis of left shoulder, M05.119 — Rheumatoid lung disease with rheumatoid arthritis of unspecified shoulder, M05.121 — Rheumatoid lung disease with rheumatoid arthritis of right elbow, M05.122 — Rheumatoid lung disease with rheumatoid arthritis of left elbow, M05.129 — Rheumatoid lung disease with rheumatoid arthritis of unspecified elbow, M05.131 — Rheumatoid lung disease with rheumatoid arthritis of right wrist, M05.132 — Rheumatoid lung disease with rheumatoid arthritis of left wrist, M05.139 — Rheumatoid lung disease with rheumatoid arthritis of unspecified wrist, +59 more

Contextual Map

Every relationship of J99 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 J99 with these 17 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
• J96-J99 — Other diseases of the respiratory system[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026

Excludes1 (22)

• A06.5 — Amebic lung abscess[Excludes1]: “amebiasis (A06.5)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• A52.72 — Syphilis of lung and bronchus[Excludes1]: “late syphilis (A52.72, A52.73)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• A52.73 — Symptomatic late syphilis of other respiratory organs[Excludes1]: “late syphilis (A52.72, A52.73)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• B37.1 — Pulmonary candidiasis[Excludes1]: “candidiasis (B37.1)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• B38.0 — Acute pulmonary coccidioidomycosis[Excludes1]: “coccidioidomycosis (B38.0-B38.2)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• B38.1 — Chronic pulmonary coccidioidomycosis[Excludes1]: “coccidioidomycosis (B38.0-B38.2)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• B38.2 — Pulmonary coccidioidomycosis, unspecified[Excludes1]: “coccidioidomycosis (B38.0-B38.2)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• B39.0 — Acute pulmonary histoplasmosis capsulati[Excludes1]: “histoplasmosis (B39.0-B39.2)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• and 14 more

Code First (13)

• A50 — Congenital syphilis[Code First]: “congenital syphilis (A50.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• A50.0 — Early congenital syphilis, symptomatic[Code First]: “early congenital syphilis (A50.0-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• B49 — Unspecified mycosis[Code First]: “bronchomycosis (B49)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• B65.0 — Schistosomiasis due to Schistosoma haematobium [urinary schistosomiasis][Code First]: “schistosomiasis (B65.0-B65.9)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• B65.1 — Schistosomiasis due to Schistosoma mansoni [intestinal schistosomiasis][Code First]: “schistosomiasis (B65.0-B65.9)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• B65.2 — Schistosomiasis due to Schistosoma japonicum[Code First]: “schistosomiasis (B65.0-B65.9)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• B65.3 — Cercarial dermatitis[Code First]: “schistosomiasis (B65.0-B65.9)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• B65.8 — Other schistosomiasis[Code First]: “schistosomiasis (B65.0-B65.9)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026
• and 5 more

Referenced by Use Additional Code instructions

• E88.02 — Plasminogen deficiency[Use Additional Code]: “respiratory disorder related to plasminogen deficiency (J99)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2026

Referenced by Index etiology/manifestation pairs

• B67.99 — Other echinococcosis[Index manifestation]: “Cyst, hydatid, lung NEC”— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026

Clinical classification (CCSR)

• RSP016 — Other specified and unspecified lower respiratory disease[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 196 — INTERSTITIAL LUNG DISEASE WITH MCC[MS-DRG]: “INTERSTITIAL LUNG DISEASE WITH MCC (MDC 04)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 197 — INTERSTITIAL LUNG DISEASE WITH CC[MS-DRG]: “INTERSTITIAL LUNG DISEASE WITH CC (MDC 04)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026
• DRG 198 — INTERSTITIAL LUNG DISEASE WITHOUT CC/MCC[MS-DRG]: “INTERSTITIAL LUNG 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

Change history (2)

• FY2027 — Code First note will be added[Change history]— CMS release files (code change ledger) · icd10cm-fy2027
• and 1 more

Common coding questions

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, coding notes, decision checklist 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