J98.2 Interstitial emphysema

Billable ICD-10-CM code, FY2026.

Applicable to

• Mediastinal emphysema

Excludes1 (never code together)

• emphysema NOS (J43.9)
• emphysema in newborn (P25.0)
• surgical emphysema (subcutaneous) (T81.82)
• traumatic subcutaneous emphysema (T79.7)

Applies from J98 Other respiratory disorders

Excludes1 (never code together)

• newborn apnea (P28.4-)
• newborn sleep apnea (P28.3-)

Excludes2 (not included here)

• apnea NOS (R06.81)
• sleep apnea (G47.3-)

Use additional code

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

Risk adjustment (HCC)

• CMS-HCC V28: HCC 280 — Chronic Obstructive Pulmonary Disease, Interstitial Lung Disorders, and Other Chronic Lung Disorders
• CMS-HCC V22: HCC 111 — Chronic Obstructive Pulmonary Disease
• RxHCC V08: HCC 229 — Chronic Obstructive Pulmonary Disease, Bronchiectasis, and Other Asthma
• ESRD V24: HCC 111

MS-DRG index

Defines the logic of DRG(s) 199-201 in MDC 04.

Approximate ICD-9-CM (GEMs)

• 518.1 Interstitial emphysema

Code annotations containing back-references to J98.2

Back-references to J98.2

• Type 1 Excludes: J43 Emphysema ("interstitial emphysema (J98.2)")
• Type 1 Excludes: J43 Emphysema ("mediastinal emphysema (J98.2)")
• Type 1 Excludes: J84 Other interstitial pulmonary diseases ("interstitial emphysema (J98.2)")

Diagnosis Index entries for J98.2

• Air › anterior mediastinum
• Disease, diseased › Hamman's (spontaneous mediastinal emphysema)
• Emphysema (atrophic) (bullous) (chronic) (interlobular) (lung) (obstructive) (pulmonary) (senile) (vesicular) › interstitial
• Emphysema (atrophic) (bullous) (chronic) (interlobular) (lung) (obstructive) (pulmonary) (senile) (vesicular) › mediastinal
• Emphysema (atrophic) (bullous) (chronic) (interlobular) (lung) (obstructive) (pulmonary) (senile) (vesicular) › subcutaneous (traumatic) › nontraumatic
• Pneumomediastinum

Nearby codes

• J98.01 Acute bronchospasm
• J98.09 Other diseases of bronchus, not elsewhere classified
• J98.1 Pulmonary collapse
• J98.11 Atelectasis
• J98.19 Other pulmonary collapse
• J98.2 Interstitial emphysema (this code)
• J98.3 Compensatory emphysema
• J98.4 Other disorders of lung
• J98.5 Diseases of mediastinum, not elsewhere classified
• J98.51 Mediastinitis
• J98.59 Other diseases of mediastinum, not elsewhere classified