What is ICD-10 code J84.115?

J84.115 is the ICD-10-CM diagnosis code for Respiratory bronchiolitis interstitial lung disease. A lung disease where inflammation occurs in the small airways and surrounding tissue, typically seen in smokers with progressive breathing difficulty. It belongs to the ICD-10-CM chapter for diseases of the respiratory system (j00-j99). J84.115 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. J84.115 is part of the FY2026 ICD-10-CM code set published by the CMS National Center for Health Statistics and used on Medicare, Medicaid, and commercial claims in the United States.

Yes. J84.115 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. J84.115 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

Which HCC does J84.115 map to under V28?

J84.115 maps to CMS-HCC V28 HCC 280 (Chronic Obstructive Pulmonary Disease, Interstitial Lung Disorders, and Other Chronic Lung Disorders). The category numbers, labels, and conditions come from the CMS-HCC V28 model file for payment year 2026.

2026 ICD-10-CM J84.115: Respiratory bronchiolitis

J84.115 maps to CMS-HCC V28 280. A source-labeled RAF reference is available. Confirm the documented diagnosis and applicable coding requirements. MEAT criteria · RAF Calculator · HCC coding software

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Code lookupJ84.115

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)

J84.115

Billable / SpecificICD-10-CMOfficial ICD-10-CMCodebook guidance

Respiratory bronchiolitis interstitial lung disease

A lung disease where inflammation occurs in the small airways and surrounding tissue, typically seen in smokers with progressive breathing difficulty.

Buddy Insight

Respiratory bronchiolitis interstitial lung disease is a smoking-related interstitial lung disease that bridges the gap between simple respiratory bronchiolitis and more severe ILDs.

Overview Risk Models Code Book Documentation Audit Notes Edition comparison

CMS-HCC V28

Mapped

HCC 280

Chronic Obstructive Pulmonary...

Code-level coefficient reference

CMS-HCC V24

Historical

Not used for standard CY2026 Medicare Advantage payment. Select a historical period to review V24.

Not used for CY2026 payment

ACA/HHS

Mapped

HCC 162

HHS-HCC 162 adult, RAF varies...

Code-level coefficient reference

ESRD/PACE

Mapped

HCC 112

Fibrosis of Lung and Other Ch...

Code-level coefficient reference

RXHCC

Mapped

HCC 227

Pulmonary Fibrosis, Except Id...

Code-level coefficient reference

Code Book Path

Official

J84.1Other interstitial pulmonary diseases with fibrosis J84.11Idiopathic interstitial pneumonia J84.115Respiratory bronchiolitis interstitial lung disease

Inclusion Terms

Official

No inclusion terms are included in this display for J84.115. Check the code and parent instructions in the Code Book.

Excludes 2

Official

certain conditions originating in the perinatal period (P04-P96)Inherited from J00-J99, J84
certain infectious and parasitic diseases (A00-B99)Inherited from J00-J99, J84
complications of pregnancy, childbirth and the puerperium (O00-O9A)Inherited from J00-J99, J84
congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)Inherited from J00-J99, J84
endocrine, nutritional and metabolic diseases (E00-E88)Inherited from J00-J99, J84
injury, poisoning and certain other consequences of external causes (S00-T88)Inherited from J00-J99, J84
neoplasms (C00-D49)Inherited from J00-J99, J84
smoke inhalation (T59.81-)Inherited from J00-J99, J84
symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)Inherited from J00-J99, J84
lung diseases due to external agents (J60-J70)Inherited from J00-J99, J84

Related Codes

Official

J84.111Idiopathic interstitial pneumonia, not otherwise specified J84.112Idiopathic pulmonary fibrosis J84.113Idiopathic non-specific interstitial pneumonitis J84.114Acute interstitial pneumonitis J84.116Cryptogenic organizing pneumonia

Includes

Official

No Includes notes are included in this display for J84.115. Check the code and parent instructions in the Code Book.

Excludes 1

Official

drug-induced interstitial lung disorders (J70.2-J70.4)Inherited from J84, J84.1, J84.11
interstitial emphysema (J98.2)Inherited from J84, J84.1, J84.11
pulmonary fibrosis (chronic) following radiation (J70.1)Inherited from J84, J84.1, J84.11
lymphoid interstitial pneumonia (J84.2)Inherited from J84, J84.1, J84.11
pneumocystis pneumonia (B59)Inherited from J84, J84.1, J84.11

Code First

Official

No Code First sequencing instructions are included in this display for J84.115. 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 conditionInherited from J84, J84.1
, if applicable, pulmonary fibrosis (chronic) due to inhalation of chemicals, gases, fumes or vapors (J68.4)Inherited from J84, J84.1

Buddy Documentation Tip

HCC Buddy guidance

Documented smoking history (typically heavy, current or former smoker)

High-resolution computed tomography showing centrilobular ground-glass nodules, bronchial wall thickening, and patchy ground-glass opacities

Lung biopsy showing respiratory bronchiolitis pattern with interstitial involvement if performed

Pulmonary function tests documenting the severity and type of ventilatory defect

MEAT Support

HCC Buddy guidance

Documented smoking history (typically heavy, current or former smoker)

High-resolution computed tomography showing centrilobular ground-glass nodules, bronchial wall thickening, and patchy ground-glass opacities

Lung biopsy showing respiratory bronchiolitis pattern with interstitial involvement if performed

Pulmonary function tests documenting the severity and type of ventilatory defect

Audit Caution

HCC Buddy guidance

Coding COPD instead of RB-ILD when the interstitial component is the primary finding — these are distinct entities

Failing to document the smoking association which supports the diagnosis

Confusing with desquamative interstitial pneumonia (J84.117) which has more extensive disease on biopsy

Using unspecified interstitial lung disease codes when RB-ILD has been specifically diagnosed

Common Mistakes

HCC Buddy guidance

J84.117 — Desquamative interstitial pneumonia is a related but more severe smoking-related ILD with more extensive macrophage accumulation

J44.1 — COPD with acute exacerbation is a distinct obstructive disease; RB-ILD has restrictive or mixed physiology

J84.111 — Idiopathic interstitial pneumonia NOS should not be used when RB-ILD is specifically documented

J68.4 — Chronic respiratory conditions due to chemicals/fumes is used for non-tobacco inhalational exposures

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 →

Is J84.115 an HCC code?

Yes. J84.115 (Respiratory bronchiolitis interstitial lung disease) maps to HCC 280, Chronic Obstructive Pulmonary Disease, Interstitial Lung Disorders, and Other Chronic Lung Disorders under the CMS-HCC V28 risk adjustment model, with a source-labeled community non-dual aged reference coefficient of 0.319. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes. It is billable for payment year 2026.

Coder answer: J84.115 is billable and maps to V28 HCC 280, Chronic Obstructive Pulmonary Disease, Interstitial Lung Disorders, and Other Chronic Lung Disorders. Open it in the Code Book for the tabular path, RAF, and MEAT checklist.

Code: J84.115
Description: Respiratory bronchiolitis interstitial lung disease
HCC (V28): HCC 280 — Chronic Obstructive Pulmonary Disease, Interstitial Lung Disorders, and Other Chronic Lung Disorders
RAF reference coefficient: 0.319
Billable: Yes
Payment year: 2026

HCC Category Mapping

V28HCC 280, Chronic Obstructive Pulmonary Disease, Interstitial Lung Disorders, and Other Chronic Lung Disorders

0.319

ESRDHCC 112, Fibrosis of Lung and Other Chronic Lung Disorders

Not separately weighted

RxHCCHCC 227, Pulmonary Fibrosis, Except Idiopathic

Not separately weighted

These are source-labeled model coefficients, not member totals. A category may still be removed by hierarchy or model cleanup rules. Weights are not directly comparable across models: CMS-HCC V28 and V24 use Community, Non-Dual, Aged; ESRD uses the dialysis continuing-enrollee model; RxHCC is the Part D continuing-enrollee, non-low-income, aged weight (a larger scale than CMS-HCC). ACA/HHS has no single weight — it varies by metal level. Actual per-patient RAF contribution depends on member context, hierarchy and cleanup rules, interactions, and the model year used by the payer. V28 is the CMS-HCC model phased in over payment years 2024–2026; V24 remains available for historical review.

Work J84.115 in the Code Book — tabular path, V28 RAF reference, and MEAT checklist →

MEAT review for J84.115

For J84.115, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule.

MMonitor: signs, symptoms, disease progression, or lab trending documented in the note
EEvaluate: test results, medication response, or physical findings reviewed by the provider
AAssess: explicit mention in the assessment or plan with acknowledgment of status
TTreat: medication, referral, procedure, therapy, or counseling tied to the diagnosis

Coder workflow notes

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What This Code Means

J84.115 is the ICD-10-CM diagnosis code for respiratory bronchiolitis interstitial lung disease. A lung disease where inflammation occurs in the small airways and surrounding tissue, typically seen in smokers with progressive breathing difficulty. J84.115 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).

Under the CMS-HCC V28 risk adjustment model, J84.115 maps to Chronic Obstructive Pulmonary Disease, Interstitial Lung Disorders, and Other Chronic Lung Disorders (HCC 280) with a source-labeled community, non-dual, aged reference coefficient of 0.319. No V24 mapping is shown for J84.115; use the applicable model and payment year when reviewing the V28 mapping. For CY2026 non-PACE Medicare Advantage, CMS uses 100% of the 2024 CMS-HCC model (V28). PACE uses a separate model blend. Source-labeled code-level coefficients are references, not member totals. Actual contribution depends on complete member context, hierarchy and cleanup rules, interactions, and model year. HCC Buddy's RAF Calculator supports CMS-HCC V28 PY2026 and shows no score unless every required source and calculation check passes.

Confirm smoking history documentation, as this condition is strongly associated with tobacco use. For J84.115, confirm that the documentation supports the diagnosis and meets the applicable coding, encounter, program and payer requirements. MEAT (Monitor, Evaluate, Assess, or Treat) is a review mnemonic, not a universal CMS coding rule. When documentation is ambiguous, coders should issue a provider query rather than assume the highest-specificity variant.

HCC Buddy maintains structured V28 and V24 mapping, source-labeled coefficient references, and MEAT documentation criteria for J84.115 sourced directly from the CMS-HCC risk adjustment model files and the CMS ICD-10-CM code set.

Coding Tips

•Confirm smoking history documentation, as this condition is strongly associated with tobacco use
•Ensure distinction from other interstitial lung diseases with similar presentations

Clinical Significance

Respiratory bronchiolitis interstitial lung disease is a smoking-related interstitial lung disease that bridges the gap between simple respiratory bronchiolitis and more severe ILDs. This condition indicates significant small-airway and interstitial involvement requiring smoking cessation intervention, monitoring, and potential immunosuppressive therapy. Capturing this diagnosis reflects the chronic respiratory management burden.

Documentation Requirements

✓Documented smoking history (typically heavy, current or former smoker)
✓High-resolution computed tomography showing centrilobular ground-glass nodules, bronchial wall thickening, and patchy ground-glass opacities
✓Lung biopsy showing respiratory bronchiolitis pattern with interstitial involvement if performed
✓Pulmonary function tests documenting the severity and type of ventilatory defect
✓Documentation distinguishing this from simple respiratory bronchiolitis (which does not have ILD component)

Commonly Confused Codes

•J84.117: Desquamative interstitial pneumonia is a related but more severe smoking-related ILD with more extensive macrophage accumulation
•J44.1: COPD with acute exacerbation is a distinct obstructive disease; RB-ILD has restrictive or mixed physiology
•J84.111: Idiopathic interstitial pneumonia NOS should not be used when RB-ILD is specifically documented
•J68.4: Chronic respiratory conditions due to chemicals/fumes is used for non-tobacco inhalational exposures