MS-DRG · FY 2026 v43.0
MS-DRG 198 – Interstitial Lung Disease without CC/MCC
A Medical DRG in MDC 04 (Diseases & Disorders of the Respiratory System). Inpatient cases group to DRG 198 when the ICD-10-CM principal diagnosis is one of the 100 codes listed below and no secondary diagnosis on the CC or MCC lists is present. Its FY 2026 relative weight is 0.7162 with a geometric mean length of stay of 2.2 days.
Medical DRG – assigned by principal diagnosis✓ Official CMS v43.0 dataset
0.7162
Relative Weight
2.2
Geometric Mean LOS (days)
2.7
Arithmetic Mean LOS (days)
100
Principal Diagnosis Codes
Severity family
DRG 196with MCCWeight 1.8872 · GMLOS 4.8 daysDRG 197with CCWeight 0.9491 · GMLOS 2.9 daysDRG 198without CC/MCCWeight 0.7162 · GMLOS 2.2 days
How a case is assigned to DRG 198
The grouper first assigns the case to MDC 04 from the principal diagnosis and finds no qualifying operating-room procedure (this is a Medical DRG; ICD-10-PCS codes do not drive assignment here), then applies the severity split from secondary diagnoses: with MCC → 196; with CC → 197; without CC/MCC → 198.
ICD-10-CM
Principal Diagnosis Codes 100 codes · 18 categories
100 of 100 shown
B44 Aspergillosis1 code
- B44.81 Allergic bronchopulmonary aspergillosis
B90 Sequelae of tuberculosis1 code
- B90.9 Sequelae of respiratory and unspecified tuberculosis
D86 Sarcoidosis13 codes
- D86.0 Sarcoidosis of lung
- D86.1 Sarcoidosis of lymph nodes
- D86.2 Sarcoidosis of lung with sarcoidosis of lymph nodes
- D86.3 Sarcoidosis of skin
- D86.81 Sarcoid meningitis
- D86.82 Multiple cranial nerve palsies in sarcoidosis
- D86.83 Sarcoid iridocyclitis
- D86.84 Sarcoid pyelonephritis
- D86.85 Sarcoid myocarditis
- D86.86 Sarcoid arthropathy
- D86.87 Sarcoid myositis
- D86.89 Sarcoidosis of other sites
- D86.9 Sarcoidosis, unspecified
J60 Coalworker's pneumoconiosis1 code
- J60 Coalworker's pneumoconiosis
J61 Pneumoconiosis due to asbestos and other mineral fibers1 code
- J61 Pneumoconiosis due to asbestos and other mineral fibers
J62 Pneumoconiosis due to dust containing silica2 codes
J63 Pneumoconiosis due to other inorganic dusts7 codes
J64 Unspecified pneumoconiosis1 code
- J64 Unspecified pneumoconiosis
J65 Pneumoconiosis associated with tuberculosis1 code
- J65 Pneumoconiosis associated with tuberculosis
J66 Airway disease due to specific organic dust4 codes
J67 Hypersensitivity pneumonitis due to organic dust10 codes
- J67.0 Farmer's lung
- J67.1 Bagassosis
- J67.2 Bird fancier's lung
- J67.3 Suberosis
- J67.4 Maltworker's lung
- J67.5 Mushroom-worker's lung
- J67.6 Maple-bark-stripper's lung
- J67.7 Air conditioner and humidifier lung
- J67.8 Hypersensitivity pneumonitis due to other organic dusts
- J67.9 Hypersensitivity pneumonitis due to unspecified organic dust
J70 Respiratory conditions due to other external agents1 code
- J70.1 Chronic and other pulmonary manifestations due to radiation
J82 Pulmonary eosinophilia, not elsewhere classified4 codes
J84 Other interstitial pulmonary diseases24 codes
- J84.01 Alveolar proteinosis
- J84.02 Pulmonary alveolar microlithiasis
- J84.03 Idiopathic pulmonary hemosiderosis
- J84.09 Other alveolar and parieto-alveolar conditions
- J84.10 Pulmonary fibrosis, unspecified
- J84.111 Idiopathic interstitial pneumonia, not otherwise specified
- 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
- J84.170 Interstitial lung disease with progressive fibrotic phenotype in diseases classified elsewhere
- J84.178 Other interstitial pulmonary diseases with fibrosis in diseases classified elsewhere
- J84.2 Lymphoid interstitial pneumonia
- J84.81 Lymphangioleiomyomatosis
- J84.82 Adult pulmonary Langerhans cell histiocytosis
- J84.83 Surfactant mutations of the lung
- J84.841 Neuroendocrine cell hyperplasia of infancy
- J84.842 Pulmonary interstitial glycogenosis
- J84.843 Alveolar capillary dysplasia with vein misalignment
- J84.848 Other interstitial lung diseases of childhood
- J84.89 Other specified interstitial pulmonary diseases
- J84.9 Interstitial pulmonary disease, unspecified
J99 Respiratory disorders in diseases classified elsewhere1 code
- J99 Respiratory disorders in diseases classified elsewhere
M05 Rheumatoid arthritis with rheumatoid factor23 codes
- M05.10 Rheumatoid lung disease with rheumatoid arthritis of unspecified site
- M05.111 Rheumatoid lung disease with rheumatoid arthritis of right shoulder
- M05.112 Rheumatoid lung disease with rheumatoid arthritis of left shoulder
- M05.119 Rheumatoid lung disease with rheumatoid arthritis of unspecified shoulder
- M05.121 Rheumatoid lung disease with rheumatoid arthritis of right elbow
- M05.122 Rheumatoid lung disease with rheumatoid arthritis of left elbow
- M05.129 Rheumatoid lung disease with rheumatoid arthritis of unspecified elbow
- M05.131 Rheumatoid lung disease with rheumatoid arthritis of right wrist
- M05.132 Rheumatoid lung disease with rheumatoid arthritis of left wrist
- M05.139 Rheumatoid lung disease with rheumatoid arthritis of unspecified wrist
- M05.141 Rheumatoid lung disease with rheumatoid arthritis of right hand
- M05.142 Rheumatoid lung disease with rheumatoid arthritis of left hand
- M05.149 Rheumatoid lung disease with rheumatoid arthritis of unspecified hand
- M05.151 Rheumatoid lung disease with rheumatoid arthritis of right hip
- M05.152 Rheumatoid lung disease with rheumatoid arthritis of left hip
- M05.159 Rheumatoid lung disease with rheumatoid arthritis of unspecified hip
- M05.161 Rheumatoid lung disease with rheumatoid arthritis of right knee
- M05.162 Rheumatoid lung disease with rheumatoid arthritis of left knee
- M05.169 Rheumatoid lung disease with rheumatoid arthritis of unspecified knee
- M05.171 Rheumatoid lung disease with rheumatoid arthritis of right ankle and foot
- M05.172 Rheumatoid lung disease with rheumatoid arthritis of left ankle and foot
- M05.179 Rheumatoid lung disease with rheumatoid arthritis of unspecified ankle and foot
- M05.19 Rheumatoid lung disease with rheumatoid arthritis of multiple sites
M34 Systemic sclerosis [scleroderma]1 code
- M34.81 Systemic sclerosis with lung involvement
P27 Chronic respiratory disease originating in the perinatal period4 codes
ICD-10-PCS
Procedure Codes
Procedure codes do not drive assignment for this DRG. DRG 198 is a Medical DRG, assigned from the principal diagnosis above.
Frequently Asked Questions
What is MS-DRG 198?
MS-DRG 198 (Interstitial Lung Disease without CC/MCC) is a medical DRG in MDC 04 (Diseases & Disorders of the Respiratory System). Its FY 2026 relative weight is 0.7162 with a geometric mean length of stay of 2.2 days.
What is the difference between DRG 196, 197, 198?
All 3 share the same base category; the severity of secondary diagnoses separates them: 196 (with MCC), 197 (with CC), 198 (without CC/MCC). A major complication or comorbidity (MCC) places the case in the highest-weighted DRG of the family; a CC in the middle; neither in the lowest.
How many diagnosis codes group to DRG 198?
100 ICD-10-CM principal diagnosis codes group to this DRG, spanning 18 three-character categories.
What is the relative weight of DRG 198?
The FY 2026 relative weight of this DRG is 0.7162, meaning reimbursement of roughly 0.72 times the average Medicare inpatient case. Multiply by a hospital's blended base rate for the approximate payment.
Source: CMS ICD-10 MS-DRG v43.0 Definitions Manual and the FY 2026 IPPS Final Rule (Table 5), effective October 1, 2025 through September 30, 2026. We publish the DRG assignments as CMS defines them and add the navigation, search, and code links.
