2026 ICD-10-CM J84: Other interstitial pulmonary diseases

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J84 is not a CMS-HCC payment code. MEAT criteria · RAF Calculator · HCC Buddy coding tools

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Code lookupJ84

Effective periodFY2026 Apr Update (Apr 1-Sep 30)

FY 2026 Apr update / Diseases of the respiratory system (J00-J99) / Other respiratory diseases principally affecting the interstitium (J80-J84)

J84

Header CodeICD-10-CMOfficial ICD-10-CMCodebook guidance

Other interstitial pulmonary diseases

Overview Risk Models Code Book Documentation Audit Notes Edition comparison

CMS-HCC V28

N/A

—

Not risk-adjusted for this model/period.

Not mapped

CMS-HCC V24

N/A

—

Not risk-adjusted for this model/period.

Not mapped

ACA/HHS

N/A

—

Not risk-adjusted for this model/period.

Not mapped

ESRD/PACE

N/A

—

Not risk-adjusted for this model/period.

Not mapped

RXHCC

N/A

—

Not risk-adjusted for this model/period.

Not mapped

Code Book Path

Official

J8Other respiratory diseases principally affecting the interstitium (J80-J84)J84Other interstitial pulmonary diseases

Inclusion Terms

Official

No inclusion terms are included in this display for J84. Check the code and parent instructions in the Code Book.

Excludes 2

Official

lung diseases due to external agents (J60-J70)
certain conditions originating in the perinatal period (P04-P96)Inherited from J00-J99
certain infectious and parasitic diseases (A00-B99)Inherited from J00-J99
complications of pregnancy, childbirth and the puerperium (O00-O9A)Inherited from J00-J99
congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)Inherited from J00-J99
endocrine, nutritional and metabolic diseases (E00-E88)Inherited from J00-J99
injury, poisoning and certain other consequences of external causes (S00-T88)Inherited from J00-J99
neoplasms (C00-D49)Inherited from J00-J99
smoke inhalation (T59.81-)Inherited from J00-J99
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)Inherited from J00-J99

Related Codes

Official

J84.0Alveolar and parieto-alveolar conditions J84.1Other interstitial pulmonary diseases with fibrosis J84.2Lymphoid interstitial pneumonia J84.8Other specified interstitial pulmonary diseases J84.9Interstitial pulmonary disease, unspecified

Includes

Official

No Includes notes are included in this display for J84. Check the code and parent instructions in the Code Book.

Excludes 1

Official

drug-induced interstitial lung disorders (J70.2-J70.4)
interstitial emphysema (J98.2)

Code First

Official

No Code First sequencing instructions are included in this display for J84. Check the code and parent instructions in the Code Book.

Use Additional

Official

code, where applicable, to identify:Inherited from J00-J99
exposure to environmental tobacco smoke (Z77.22)Inherited from J00-J99
exposure to tobacco smoke in the perinatal period (P96.81)Inherited from J00-J99
history of tobacco dependence (Z87.891)Inherited from J00-J99
occupational exposure to environmental tobacco smoke (Z57.31)Inherited from J00-J99
tobacco dependence (F17.-)Inherited from J00-J99
tobacco use (Z72.0)Inherited from J00-J99

Code Also

Official

, if applicable, associated condition

Current with CMS: FY2026 ICD-10-CM Apr 1 update (effective Apr 1 – Sep 30, 2026) · CMS-HCC V28, 100% phased in for payment year 2026. FY2027 code set already staged for October 1, 2026. How HCC Buddy stays current →

Code: J84
Description: Other interstitial pulmonary diseases
HCC (V28): No CMS-HCC V28 mapping
RAF reference coefficient: —
Billable: No
Payment year: 2026

Coder workflow notes

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What This Code Means

J84 is the ICD-10-CM diagnosis code for other interstitial pulmonary diseases. J84 sits in the ICD-10-CM chapter for diseases of the respiratory system (j00-j99), within the section covering other respiratory diseases principally affecting the interstitium (j80-j84).

Header codes like J84 cannot be reported on claims directly; they organize child codes that share clinical context. Coders should select the billable child code that matches the documented presentation and then verify its current source-backed HCC mapping. Do not infer a child code or risk adjustment value from the header alone.

HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for J84 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Excludes 1, Do NOT code together

drug-induced interstitial lung disorders (J70.2-J70.4)
interstitial emphysema (J98.2)

Excludes 2, Not included here, may code separately

lung diseases due to external agents (J60-J70)

Code Also

, if applicable, associated condition

Child Codes

J84.0Alveolar and parieto-alveolar conditions

J84.1Other interstitial pulmonary diseases with fibrosis

J84.2Lymphoid interstitial pneumonia

J84.8Other specified interstitial pulmonary diseases

J84.9Interstitial pulmonary disease, unspecified

Code Hierarchy

└J84Other interstitial pulmonary diseases

└J84Other interstitial pulmonary diseases

More on J84

Referenced in blog posts

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