2027 ICD-10-CM Diagnosis Code J98.2Interstitial emphysema
J98.2 is a billable ICD-10-CM diagnosis code for interstitial emphysema. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 199 through 201, 791, 793. Coders also document this condition as interstitial emphysema of lung. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Pleurisy, pleural effusion and pulmonary collapse.
For Medicare Advantage risk adjustment, J98.2 maps to CMS-HCC Category 280 (Chronic Obstructive Pulmonary Disease, Interstitial Lung Disorders, and Other Chronic Lung Disorders) under the V28 model, adding a risk factor of about 0.319 for a community, non-dual, aged beneficiary in payment year 2027.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
J98.2 maps to a payment category in the CMS-HCC model used to risk-adjust Medicare Advantage payments. Weights are the published community factors for payment year 2027.
Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Interstitial emphysema of lung
- Mediastinal emphysema
- Subcutaneous emphysema
- Tension pneumomediastinum
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to J98.2: its own notes plus those printed at J98 and Chapter 10. A note printed at a category, block or chapter applies to every code under it.
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Mediastinal emphysema
Excludes1
Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
- certain conditions originating in the perinatal period (P04-P96)
- certain infectious and parasitic diseases (A00-B99)
- complications of pregnancy, childbirth and the puerperium (O00-O9A)
- congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
- endocrine, nutritional and metabolic diseases (E00-E88)
- injury, poisoning and certain other consequences of external causes (S00-T88)
- neoplasms (C00-D49)
- smoke inhalation (T59.81-)
- symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)
Notes
General instructions on how these codes are used.
- When a respiratory condition is described as occurring in more than one site and is not specifically indexed, it should be classified to the lower anatomic site (e.g. tracheobronchitis to bronchitis in J40).
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name J98.2, its category, or a range that includes it.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
anterior mediastinum J98.2
Disease, diseased See Also: Syndrome;
Emphysema (atrophic) (bullous) (chronic) (interlobular) (lung) (obstructive) (pulmonary) (senile) (vesicular) J43.9
interstitial J98.2
mediastinal J98.2
subcutaneous (traumatic) T79.7
nontraumatic J98.2
Pneumomediastinum J98.2
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Mediastinal Emphysema
presence of air in the mediastinal tissues due to leakage of air from the tracheobronchial tree, usually as a result of trauma.
Patient EducationClinical
Emphysema
Emphysema is a type of COPD (chronic obstructive pulmonary disease). COPD is a group of lung diseases that make it hard to breathe and get worse over time. The other main type of COPD is chronic bronchitis. Most people with COPD have both emphysema and chronic bronchitis, but how severe each type is can be different from person to person.
The full article covers:
- What is emphysema?
- What causes emphysema?
- Who is at risk for emphysema?
- What are the symptoms of emphysema?
- How is emphysema diagnosed?
- What are the treatments for emphysema?
- Can emphysema be prevented?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert J98.2 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About J98.2Overview
What is the ICD-10 code for interstitial emphysema?
The ICD-10-CM code for interstitial emphysema is J98.2 (sometimes written as J982). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is J98.2 (Other respiratory disorders) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report interstitial emphysema on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does J98.2 group to?
When interstitial emphysema is the principal diagnosis on an inpatient stay, it groups to MS-DRG 793, 791, 201, 199, 200, with relative weights from 0.6782 to 4.2192 depending on complications. Higher weights mean higher Medicare reimbursement.
Can J98.2 be reported with J43.9?
Not as a rule. The Excludes1 note on J98.2 lists "emphysema NOS (J43.9)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).
Does J98.2 need an additional code?
When the condition applies, yes. The Use Additional Code note at J98, which applies to J98.2, reads: 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.-); and 1 more listed in the Instructional Notes section. The additional code is reported after J98.2.
What HCC is J98.2?
J98.2 (interstitial emphysema) maps to CMS-HCC Category 280 (Chronic Obstructive Pulmonary Disease, Interstitial Lung Disorders, and Other Chronic Lung Disorders), commonly written as HCC 280, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2027. It mapped to HCC 111 under the retired V24 model. It also maps in the PACE (CMS-HCC V22), ESRD (V21), and ESRD (V24) models. In the Part D prescription drug model it maps to RxHCC 229.
Does J98.2 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, J98.2 adds a risk adjustment factor of about 0.319 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.209 to 0.390 depending on the payment segment). A more severe related category (HCC 276, HCC 277, HCC 278, and HCC 279) supersedes it when both are reported. See the full factor table on the HCC 280 category page.
