J84.2 — Lymphoid interstitial pneumonia
J84.2 is a billable, specific ICD-10-CM code for lymphoid interstitial pneumonia. It is valid for submission on a claim.
Inclusion terms
Alternative wordings a physician may use in the chart for this same code.
- Lymphoid interstitial pneumonitis
Excludes1 inherited from the categories above J84.2
These are not written on J84.2, but they bind it: a note on a category applies to every code beneath it. Billing J84.2 with anything listed here is a denial.
Excludes2 inherited from the categories above J84.2
Also inherited, and the opposite of Excludes1: these conditions are not part of J84.2, but a patient can have both, so you may code both.
Other codes that can never be billed with J84.2
These codes carry an Excludes1 note pointing at J84.2. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading J84.2 alone.
Risk adjustment
J84.2 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:
- HCC 280 Chronic Obstructive Pulmonary Disease, Interstitial Lung Disorders, and Other Chronic Lung Disorders0.319 RAF
Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score.
Medicare coverage
J84.2 is named in 13 Medicare coverage policies — 13 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A56580Billing and Coding: Computerized Axial Tomography (CT), Thorax
- A56717Billing and Coding: Respiratory Therapy (Respiratory Care)
- A56730Billing and Coding: Respiratory Therapy and Oximetry Services
- A56784Billing and Coding: Pulmonary Stress Testing
How J84.2 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to J84.2.
- Pneumonia›lymphoid interstitial
- Pneumonitis›lymphoid, interstitial
- Pneumonia›interstitial›lymphoid
- Pneumonitis›interstitial›lymphoid
Code history
J84.2 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.
Related codes at this level
Codes that share J84. If J84.2 is not quite right, the correct code is usually one of these.
Questions about J84.2
- Is J84.2 a billable ICD-10-CM code?
- Yes. J84.2 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does J84.2 sit in the tabular list?
- Diseases of the respiratory system (J00-J99), in the block Other respiratory diseases principally affecting the interstitium (J80-J84).
- What cannot be coded together with J84.2?
- J84.2 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above J84.2 (J84) and apply to it just the same.