Is J84.842 a billable ICD-10-CM code?

Yes. J84.842 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does J84.842 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 J84.842?

J84.842 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 J84.842 (J84.8, J84) and apply to it just the same.

J84.842

J84.842 — Pulmonary interstitial glycogenosis

Billable / specific codeICD-10-CM

J84.842 is a billable, specific ICD-10-CM code for pulmonary interstitial glycogenosis. It is valid for submission on a claim.

Excludes1 inherited from the categories above J84.842

These are not written on J84.842, but they bind it: a note on a category applies to every code beneath it. Billing J84.842 with anything listed here is a denial.

Written on J84.8 — Other specified interstitial pulmonary diseases

exogenous lipoid pneumonia (J69.1)
unspecified lipoid pneumonia (J69.1)

Written on J84 — Other interstitial pulmonary diseases

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

Excludes2 inherited from the categories above J84.842

Also inherited, and the opposite of Excludes1: these conditions are not part of J84.842, but a patient can have both, so you may code both.

Written on J84 — Other interstitial pulmonary diseases

lung diseases due to external agents (J60-J70)

Risk adjustment

J84.842 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Medicare coverage

J84.842 is named in 4 Medicare coverage policies — 4 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)
A56784Billing and Coding: Pulmonary Stress Testing
A57224Billing and Coding: Respiratory Care

How J84.842 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 J84.842.

Glycogenosis›pulmonary interstitial

Code history

J84.842 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 J84.84. If J84.842 is not quite right, the correct code is usually one of these.

Questions about J84.842

Is J84.842 a billable ICD-10-CM code?: Yes. J84.842 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does J84.842 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 J84.842?: J84.842 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 J84.842 (J84.8, J84) and apply to it just the same.