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  3. Diagnosis Codes in MS-DRG 179 - Respiratory Infections And Inflammations Without CC/MCC

Diagnosis Codes in MS-DRG 179 - Respiratory Infections And Inflammations Without CC/MCC

The Medicare Severity Diagnosis-Related Group (MS-DRG) is a patient classification system used to categorize hospital cases based on clinical similarity and expected resource use. MS-DRGs organize all possible principal diagnoses into mutually exclusive groups known as Major Diagnostic Categories (MDCs), which help determine reimbursement under the Medicare Inpatient Prospective Payment System.

This section lists the diagnosis codes included in MS-DRG V42.0: Respiratory Infections and Inflammations without CC/MCC from October 1, 2024, through September 30, 2025.

MS-DRG: 179

MS-DRG Title: Respiratory Infections and Inflammations without CC/MCC

MCD: 04

Relative Weight: 0.7697 Relative Weight
The relative weight of a diagnostic related group determines the reimbursement rate based on the severity of a patient's illness and the associated cost of care during hospitalization.

Geometric LOS: 0.77 Geometric Length of Stay
The geometric mean length of stay (GMLOS) is used by Medicare to calculate the reimbursement for patients whose medical treatment takes a much longer or shorter time than average.

Arithmetic LOS: 2.50 Arithmetic Length of Stay
The average length of stay (ALOS) reflects the average number of days a patient spends in a hospital for each admission.

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    • B59 - Pneumocystosis

    • J17 - Pneumonia in diseases classified elsewhere

  • A02.2 - Localized salmonella infections

    • A02.22 - Salmonella pneumonia

  • A06 - Amebiasis

    • A06.5 - Amebic lung abscess

  • A15 - Respiratory tuberculosis

    • A15.0 - Tuberculosis of lung

    • A15.4 - Tuberculosis of intrathoracic lymph nodes

    • A15.5 - Tuberculosis of larynx, trachea and bronchus

    • A15.6 - Tuberculous pleurisy

    • A15.7 - Primary respiratory tuberculosis

    • A15.8 - Other respiratory tuberculosis

    • A15.9 - Respiratory tuberculosis unspecified

  • A20 - Plague

    • A20.2 - Pneumonic plague

  • A21 - Tularemia

    • A21.2 - Pulmonary tularemia

  • A22 - Anthrax

    • A22.1 - Pulmonary anthrax

  • A31 - Infection due to other mycobacteria

    • A31.0 - Pulmonary mycobacterial infection

  • A42 - Actinomycosis

    • A42.0 - Pulmonary actinomycosis

  • A43 - Nocardiosis

    • A43.0 - Pulmonary nocardiosis

  • A48 - Other bacterial diseases, not elsewhere classified

    • A48.1 - Legionnaires' disease

  • A52.7 - Other symptomatic late syphilis

    • A52.72 - Syphilis of lung and bronchus

  • B01 - Varicella [chickenpox]

    • B01.2 - Varicella pneumonia

  • B05 - Measles

    • B05.2 - Measles complicated by pneumonia

  • B25 - Cytomegaloviral disease

    • B25.0 - Cytomegaloviral pneumonitis

  • B37 - Candidiasis

    • B37.1 - Pulmonary candidiasis

  • B38 - Coccidioidomycosis

    • B38.0 - Acute pulmonary coccidioidomycosis

    • B38.1 - Chronic pulmonary coccidioidomycosis

    • B38.2 - Pulmonary coccidioidomycosis, unspecified

  • B39 - Histoplasmosis

    • B39.0 - Acute pulmonary histoplasmosis capsulati

    • B39.1 - Chronic pulmonary histoplasmosis capsulati

    • B39.2 - Pulmonary histoplasmosis capsulati, unspecified

  • B44 - Aspergillosis

    • B44.0 - Invasive pulmonary aspergillosis

  • B58 - Toxoplasmosis

    • B58.3 - Pulmonary toxoplasmosis

  • B66 - Other fluke infections

  • B67 - Echinococcosis

    • B67.1 - Echinococcus granulosus infection of lung

  • E84 - Cystic fibrosis

    • E84.0 - Cystic fibrosis with pulmonary manifestations

  • J10.0 - Influenza due to other identified influenza virus with pneumonia

    • J10.00 - Influenza due to other identified influenza virus with unspecified type of pneumonia

    • J10.01 - Influenza due to other identified influenza virus with the same other identified influenza virus pneumonia

    • J10.08 - Influenza due to other identified influenza virus with other specified pneumonia

  • J11.0 - Influenza due to unidentified influenza virus with pneumonia

    • J11.00 - Influenza due to unidentified influenza virus with unspecified type of pneumonia

    • J11.08 - Influenza due to unidentified influenza virus with specified pneumonia

  • J15 - Bacterial pneumonia, not elsewhere classified

    • J15.0 - Pneumonia due to Klebsiella pneumoniae

    • J15.1 - Pneumonia due to Pseudomonas

    • J15.5 - Pneumonia due to Escherichia coli

    • J15.8 - Pneumonia due to other specified bacteria

  • J15.2 - Pneumonia due to staphylococcus

    • J15.20 - Pneumonia due to staphylococcus, unspecified

    • J15.29 - Pneumonia due to other staphylococcus

  • J15.21 - Pneumonia due to staphylococcus aureus

    • J15.211 - Pneumonia due to Methicillin susceptible Staphylococcus aureus

    • J15.212 - Pneumonia due to Methicillin resistant Staphylococcus aureus

  • J15.6 - Pneumonia due to other Gram-negative bacteria

    • J15.61 - Pneumonia due to Acinetobacter baumannii

    • J15.69 - Pneumonia due to other Gram-negative bacteria

  • J69 - Pneumonitis due to solids and liquids

    • J69.0 - Pneumonitis due to inhalation of food and vomit

    • J69.1 - Pneumonitis due to inhalation of oils and essences

    • J69.8 - Pneumonitis due to inhalation of other solids and liquids

  • J85 - Abscess of lung and mediastinum

    • J85.0 - Gangrene and necrosis of lung

    • J85.1 - Abscess of lung with pneumonia

    • J85.2 - Abscess of lung without pneumonia

    • J85.3 - Abscess of mediastinum

  • J86 - Pyothorax

    • J86.0 - Pyothorax with fistula

    • J86.9 - Pyothorax without fistula

  • J98.5 - Diseases of mediastinum, not elsewhere classified

    • J98.51 - Mediastinitis

    • J98.59 - Other diseases of mediastinum, not elsewhere classified

  • R76.1 - Nonspecific reaction to test for tuberculosis

    • R76.11 - Nonspecific reaction to tuberculin skin test without active tuberculosis

    • R76.12 - Nonspecific reaction to cell mediated immunity measurement of gamma interferon antigen response without active tuberculosis

  • U07 - Emergency use of U07