DRG 177
Medical DRGRespiratory Infections and Inflammations with MCC
What is MS-DRG 177?
MS-DRG 177 is a Medical Medicare Severity Diagnosis Related Group under Major Diagnostic Category 04 (MDC 04) with a Major Complication or Comorbidity (MCC). It maps to 63 ICD-10-CM diagnosis codes. For FY 2026 it carries a relative weight of 1.5627 with a geometric mean length of stay of 4.4 days and an arithmetic mean of 5.7 days. Hospitals use this grouping to determine reimbursement for inpatient stays under Medicare.
FY 2026 Payment Data
Official values from Table 5 of the FY 2026 IPPS Final Rule (CMS).
Related MS-DRGs in This Severity Group
The same clinical condition is split into separate DRGs by complication severity. MCC pays more than CC, which pays more than no CC/MCC.
Linked ICD-10-CM Diagnosis Mappings
- A02.22
Salmonella pneumonia
BillableChapter 1 - A06.5
Amebic lung abscess
BillableChapter 1 - A15.0
Tuberculosis of lung
BillableChapter 1 - A15.4
Tuberculosis of intrathoracic lymph nodes
BillableChapter 1 - A15.5
Tuberculosis of larynx, trachea and bronchus
BillableChapter 1 - A15.6
Tuberculous pleurisy
BillableChapter 1 - A15.7
Primary respiratory tuberculosis
BillableChapter 1 - A15.8
Other respiratory tuberculosis
BillableChapter 1 - A15.9
Respiratory tuberculosis unspecified
BillableChapter 1 - A20.2
Pneumonic plague
BillableChapter 1 - A21.2
Pulmonary tularemia
BillableChapter 1 - A22.1
Pulmonary anthrax
BillableChapter 1 - A31.0
Pulmonary mycobacterial infection
BillableChapter 1 - A42.0
Pulmonary actinomycosis
BillableChapter 1 - A43.0
Pulmonary nocardiosis
BillableChapter 1 - A48.1
Legionnaires' disease
BillableChapter 1 - A52.72
Syphilis of lung and bronchus
BillableChapter 1 - B01.2
Varicella pneumonia
BillableChapter 1 - B05.2
Measles complicated by pneumonia
BillableChapter 1 - B25.0
Cytomegaloviral pneumonitis
BillableChapter 1 - B37.1
Pulmonary candidiasis
BillableChapter 1 - B38.0
Acute pulmonary coccidioidomycosis
BillableChapter 1 - B38.1
Chronic pulmonary coccidioidomycosis
BillableChapter 1 - B38.2
Pulmonary coccidioidomycosis, unspecified
BillableChapter 1 - B39.0
Acute pulmonary histoplasmosis capsulati
BillableChapter 1 - B39.1
Chronic pulmonary histoplasmosis capsulati
BillableChapter 1 - B39.2
Pulmonary histoplasmosis capsulati, unspecified
BillableChapter 1 - B44.0
Invasive pulmonary aspergillosis
BillableChapter 1 - B58.3
Pulmonary toxoplasmosis
BillableChapter 1 - B59
Pneumocystosis
BillableChapter 1 - B66.4
Paragonimiasis
BillableChapter 1 - B67.1
Echinococcus granulosus infection of lung
BillableChapter 1 - E84.0
Cystic fibrosis with pulmonary manifestations
BillableChapter 4 - J10.00
Influenza due to other identified influenza virus with unspecified type of pneumonia
BillableChapter 10 - J10.01
Influenza due to other identified influenza virus with the same other identified influenza virus pneumonia
BillableChapter 10 - J10.08
Influenza due to other identified influenza virus with other specified pneumonia
BillableChapter 10 - J11.00
Influenza due to unidentified influenza virus with unspecified type of pneumonia
BillableChapter 10 - J11.08
Influenza due to unidentified influenza virus with specified pneumonia
BillableChapter 10 - J15.0
Pneumonia due to Klebsiella pneumoniae
BillableChapter 10 - J15.1
Pneumonia due to Pseudomonas
BillableChapter 10 - J15.20
Pneumonia due to staphylococcus, unspecified
BillableChapter 10 - J15.211
Pneumonia due to Methicillin susceptible Staphylococcus aureus
BillableChapter 10 - J15.212
Pneumonia due to Methicillin resistant Staphylococcus aureus
BillableChapter 10 - J15.29
Pneumonia due to other staphylococcus
BillableChapter 10 - J15.5
Pneumonia due to Escherichia coli
BillableChapter 10 - J15.61
Pneumonia due to Acinetobacter baumannii
BillableChapter 10 - J15.69
Pneumonia due to other Gram-negative bacteria
BillableChapter 10 - J15.8
Pneumonia due to other specified bacteria
BillableChapter 10 - J17
Pneumonia in diseases classified elsewhere
BillableChapter 10 - J69.0
Pneumonitis due to inhalation of food and vomit
BillableChapter 10 - J69.1
Pneumonitis due to inhalation of oils and essences
BillableChapter 10 - J69.8
Pneumonitis due to inhalation of other solids and liquids
BillableChapter 10 - J85.0
Gangrene and necrosis of lung
BillableChapter 10 - J85.1
Abscess of lung with pneumonia
BillableChapter 10 - J85.2
Abscess of lung without pneumonia
BillableChapter 10 - J85.3
Abscess of mediastinum
BillableChapter 10 - J86.0
Pyothorax with fistula
BillableChapter 10 - J86.9
Pyothorax without fistula
BillableChapter 10 - J98.51
Mediastinitis
BillableChapter 10 - J98.59
Other diseases of mediastinum, not elsewhere classified
BillableChapter 10 - R76.11
Nonspecific reaction to tuberculin skin test without active tuberculosis
BillableChapter 18 - R76.12
Nonspecific reaction to cell mediated immunity measurement of gamma interferon antigen response without active tuberculosis
BillableChapter 18 - U07.1
COVID-19
BillableChapter 22