J84.111: Idiopathic interstitial pneumonia, not otherwise specified
J84.111, idiopathic interstitial pneumonia, not otherwise specified, is listed as a covered diagnosis in 3 Medicare billing and coding articles that apply to 9 HCPCS Level II codes, including G0238 (Therapeutic procedures to improve respiratory function…), G0237 (Therapeutic procedures to increase strength or endurance…), G0239 (Therapeutic procedures to improve respiratory function or…). The articles come from 3 Medicare contractors. A listed diagnosis supports medical necessity only; coverage still depends on the LCD's criteria and on documentation in the medical record.
HCPCS Level II codes with J84.111 as a covered diagnosis
| Code | Description | Medicare coverage | DMEPOS fee 2026 (state range) | Articles listing it |
|---|---|---|---|---|
| G0238 | Therapeutic procedures to improve respiratory function, other than described by g0237, one on one, face to face, per 15 minutes (includes monitoring) | Carrier judgment | — | 2 |
| G0237 | Therapeutic procedures to increase strength or endurance of respiratory muscles, face to face, one on one, each 15 minutes (includes monitoring) | Carrier judgment | — | 2 |
| G0239 | Therapeutic procedures to improve respiratory function or increase strength or endurance of respiratory muscles, two or more individuals (includes monitoring) | Carrier judgment | — | 2 |
| J9312 | Injection, rituximab, 10 mg | Special coverage instructions apply | — | 1 |
| Q5123 | Injection, rituximab-arrx, biosimilar, (riabni), 10 mg | Carrier judgment | — | 1 |
| Q5119 | Injection, rituximab-pvvr, biosimilar, (ruxience), 10 mg | Carrier judgment | — | 1 |
| Q5115 | Injection, rituximab-abbs, biosimilar, (truxima), 10 mg | Special coverage instructions apply | — | 1 |
| J9260 | Injection, methotrexate sodium, 50 mg | Special coverage instructions apply | — | 1 |
| J9215 | Injection, interferon, alfa-n3, (human leukocyte derived), 250,000 iu | Special coverage instructions apply | — | 1 |
Medicare policy articles listing J84.111
- A55639: Billing and Coding: Chemotherapy Agents for Non-Oncologic Conditions (WPS Insurance Corporation (MAC - Part A, MAC - Part B); 6 Level II codes)
- A56717: Billing and Coding: Respiratory Therapy (Respiratory Care) (Palmetto GBA (MAC - Part A); 3 Level II codes). LCD with the same title: L34430
- A57224: Billing and Coding: Respiratory Care (Noridian Healthcare Solutions, LLC (MAC - Part A, MAC - Part B); 3 Level II codes). LCD with the same title: L34149
A diagnosis listed as covered in a billing and coding article supports medical necessity for the article's codes; it does not guarantee payment. Coverage depends on the LCD's criteria, the contractor's jurisdiction and documentation in the medical record.
Other J84 diagnoses (Other interstitial pulmonary diseases)
- J84.112 — Idiopathic pulmonary fibrosis
- 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
- J84.10 — Pulmonary fibrosis, unspecified
- J84.170 — Interstitial lung disease with progressive fibrotic phenotype in…
- J84.178 — Other interstitial pulmonary diseases with fibrosis in diseases…
- J84.01 — Alveolar proteinosis
- J84.02 — Pulmonary alveolar microlithiasis
- J84.03 — Idiopathic pulmonary hemosiderosis
- J84.2 — Lymphoid interstitial pneumonia
- J84.81 — Lymphangioleiomyomatosis
- J84.82 — Adult pulmonary Langerhans cell histiocytosis
- J84.89 — Other specified interstitial pulmonary diseases
Frequently asked questions
Does Medicare cover J84.111 (Idiopathic interstitial pneumonia, not otherwise specified)?
Medicare covers items and services, not diagnoses. 3 Medicare billing and coding articles list J84.111 as a covered diagnosis for 9 HCPCS Level II codes: the diagnosis can support medical necessity for those codes, but payment still depends on the LCD's coverage criteria and the medical record.
Which HCPCS codes can be billed with ICD-10 J84.111?
The Level II codes from the policies most specific to this diagnosis are G0238 (Therapeutic procedures to improve respiratory function…, 2 articles); G0237 (Therapeutic procedures to increase strength or endurance…, 2 articles); G0239 (Therapeutic procedures to improve respiratory function or…, 2 articles); J9312 (Injection, rituximab, 10 mg, 1 article); Q5123 (Injection, rituximab-arrx, biosimilar, (riabni), 10 mg, 1 article). Code choice depends on the item supplied; check each code's descriptor.
Which Medicare policy articles list J84.111?
A55639 (Billing and Coding: Chemotherapy Agents for Non-Oncologic Conditions); A56717 (Billing and Coding: Respiratory Therapy (Respiratory Care)); A57224 (Billing and Coding: Respiratory Care).
What is ICD-10-CM code J84.111?
J84.111 is the ICD-10-CM code for idiopathic interstitial pneumonia, not otherwise specified, in category J84 (Other interstitial pulmonary diseases), chapter 10: Diseases of the respiratory system.
Next steps
- Run a reimbursement report for a device billed under G0238
- Watch G0238 for fee, coverage and descriptor changes
- Build a full Medicare revenue model for G0238
Sources: CMS Medicare Coverage Database billing and coding articles (covered ICD-10 code lists and HCPCS links); ICD-10-CM FY2026; CMS HCPCS Level II release October 2026; CMS DMEPOS fee schedule 2026 (non-rural state fees). Not billing or legal advice.
Chapter 10: Diseases of the respiratory system · All diagnoses · HCPCS lookup