Diagnosis Codes in MS-DRG 866 - VIRAL ILLNESS WITHOUT MCC

The Medicare Severity Diagnosis-Related Group or MS-DRG is a patient classification scheme which provides a means of relating the type of patients a hospital treats. The DRGs divides all possible principal diagnoses into mutually exclusive principal diagnosis areas referred to as Major Diagnostic Categories (MDC). This is the group for Diagnosis Codes in MS-DRG 866 - VIRAL ILLNESS WITHOUT Major Complication or Comorbidity diseases in version MS-DRG V41.0 applicable from 10/01/2023 through 09/30/2024.

MS-DRG MS-DRG Title MCD Relative Weight Geometric LOS Arithmetic LOS
866 VIRAL ILLNESS WITHOUT MCC 18 0.9177 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.
0.92 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.
2.80 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.

List of ICD-10-CM Codes in Diagnostic Related Group


    • A70 Chlamydia psittaci infections
    • A90 Dengue fever [classical dengue]
    • A91 Dengue hemorrhagic fever
    • A94 Unspecified arthropod-borne viral fever
    • A99 Unspecified viral hemorrhagic fever
    • B03 Smallpox
    • B04 Monkeypox
    • B09 Unspecified viral infection characterized by skin and mucous membrane lesions
    • Z21 Asymptomatic human immunodeficiency virus [HIV] infection status
  • A74.8
    • A74.81 Chlamydial peritonitis
    • A74.89 Other chlamydial diseases
  • A74
    • A74.9 Chlamydial infection, unspecified
  • A80
    • A80.4 Acute nonparalytic poliomyelitis
  • A92
    • A92.0 Chikungunya virus disease
    • A92.1 O'nyong-nyong fever
    • A92.4 Rift Valley fever
    • A92.5 Zika virus disease
    • A92.8 Other specified mosquito-borne viral fevers
    • A92.9 Mosquito-borne viral fever, unspecified
  • A92.3
    • A92.30 West Nile virus infection, unspecified
    • A92.31 West Nile virus infection with encephalitis
    • A92.32 West Nile virus infection with other neurologic manifestation
    • A92.39 West Nile virus infection with other complications
  • A93
    • A93.0 Oropouche virus disease
    • A93.1 Sandfly fever
    • A93.2 Colorado tick fever
    • A93.8 Other specified arthropod-borne viral fevers
  • A95
    • A95.0 Sylvatic yellow fever
    • A95.1 Urban yellow fever
    • A95.9 Yellow fever, unspecified
  • A96
    • A96.0 Junin hemorrhagic fever
    • A96.1 Machupo hemorrhagic fever
    • A96.2 Lassa fever
    • A96.8 Other arenaviral hemorrhagic fevers
    • A96.9 Arenaviral hemorrhagic fever, unspecified
  • A98
    • A98.0 Crimean-Congo hemorrhagic fever
    • A98.1 Omsk hemorrhagic fever
    • A98.2 Kyasanur Forest disease
    • A98.3 Marburg virus disease
    • A98.4 Ebola virus disease
    • A98.8 Other specified viral hemorrhagic fevers
  • B05
    • B05.9 Measles without complication
  • B06
    • B06.9 Rubella without complication
  • B08.01
  • B08.0
    • B08.04 Paravaccinia, unspecified
    • B08.09 Other orthopoxvirus infections
  • B08
    • B08.3 Erythema infectiosum [fifth disease]
    • B08.4 Enteroviral vesicular stomatitis with exanthem
    • B08.8 Other specified viral infections characterized by skin and mucous membrane lesions
  • B08.6
    • B08.60 Parapoxvirus infection, unspecified
    • B08.61 Bovine stomatitis
    • B08.62 Sealpox
    • B08.69 Other parapoxvirus infections
  • B08.7
    • B08.70 Yatapoxvirus infection, unspecified
    • B08.71 Tanapox virus disease
    • B08.72 Yaba pox virus disease
    • B08.79 Other yatapoxvirus infections
  • B25
    • B25.8 Other cytomegaloviral diseases
    • B25.9 Cytomegaloviral disease, unspecified
  • B26
    • B26.9 Mumps without complication
  • B27.0
    • B27.00 Gammaherpesviral mononucleosis without complication
    • B27.01 Gammaherpesviral mononucleosis with polyneuropathy
    • B27.02 Gammaherpesviral mononucleosis with meningitis
    • B27.09 Gammaherpesviral mononucleosis with other complications
  • B27.1
    • B27.10 Cytomegaloviral mononucleosis without complications
    • B27.11 Cytomegaloviral mononucleosis with polyneuropathy
    • B27.12 Cytomegaloviral mononucleosis with meningitis
    • B27.19 Cytomegaloviral mononucleosis with other complication
  • B27.8
    • B27.80 Other infectious mononucleosis without complication
    • B27.81 Other infectious mononucleosis with polyneuropathy
    • B27.82 Other infectious mononucleosis with meningitis
    • B27.89 Other infectious mononucleosis with other complication
  • B27.9
    • B27.90 Infectious mononucleosis, unspecified without complication
    • B27.91 Infectious mononucleosis, unspecified with polyneuropathy
    • B27.92 Infectious mononucleosis, unspecified with meningitis
    • B27.99 Infectious mononucleosis, unspecified with other complication
  • B33
    • B33.1 Ross River disease
    • B33.3 Retrovirus infections, not elsewhere classified
    • B33.4 Hantavirus (cardio)-pulmonary syndrome [HPS] [HCPS]
    • B33.8 Other specified viral diseases
  • B34
    • B34.0 Adenovirus infection, unspecified
    • B34.1 Enterovirus infection, unspecified
    • B34.2 Coronavirus infection, unspecified
    • B34.3 Parvovirus infection, unspecified
    • B34.4 Papovavirus infection, unspecified
    • B34.8 Other viral infections of unspecified site
    • B34.9 Viral infection, unspecified
  • B97
    • B97.0 Adenovirus as the cause of diseases classified elsewhere
    • B97.5 Reovirus as the cause of diseases classified elsewhere
    • B97.6 Parvovirus as the cause of diseases classified elsewhere
    • B97.7 Papillomavirus as the cause of diseases classified elsewhere
  • B97.1
    • B97.10 Unspecified enterovirus as the cause of diseases classified elsewhere
    • B97.11 Coxsackievirus as the cause of diseases classified elsewhere
    • B97.12 Echovirus as the cause of diseases classified elsewhere
    • B97.19 Other enterovirus as the cause of diseases classified elsewhere
  • B97.2
    • B97.21 SARS-associated coronavirus as the cause of diseases classified elsewhere
    • B97.29 Other coronavirus as the cause of diseases classified elsewhere
  • B97.3
    • B97.30 Unspecified retrovirus as the cause of diseases classified elsewhere
    • B97.31 Lentivirus as the cause of diseases classified elsewhere
    • B97.32 Oncovirus as the cause of diseases classified elsewhere
    • B97.33 Human T-cell lymphotrophic virus, type I [HTLV-I] as the cause of diseases classified elsewhere
    • B97.34 Human T-cell lymphotrophic virus, type II [HTLV-II] as the cause of diseases classified elsewhere
    • B97.35 Human immunodeficiency virus, type 2 [HIV 2] as the cause of diseases classified elsewhere
    • B97.39 Other retrovirus as the cause of diseases classified elsewhere
  • B97.8
    • B97.81 Human metapneumovirus as the cause of diseases classified elsewhere
    • B97.89 Other viral agents as the cause of diseases classified elsewhere
  • J09.X
    • J09.X3 Influenza due to identified novel influenza A virus with gastrointestinal manifestations
    • J09.X9 Influenza due to identified novel influenza A virus with other manifestations
  • J10
    • J10.2 Influenza due to other identified influenza virus with gastrointestinal manifestations
  • J10.8
    • J10.81 Influenza due to other identified influenza virus with encephalopathy
    • J10.82 Influenza due to other identified influenza virus with myocarditis
    • J10.83 Influenza due to other identified influenza virus with otitis media
    • J10.89 Influenza due to other identified influenza virus with other manifestations
  • J11
    • J11.2 Influenza due to unidentified influenza virus with gastrointestinal manifestations
  • J11.8
    • J11.81 Influenza due to unidentified influenza virus with encephalopathy
    • J11.82 Influenza due to unidentified influenza virus with myocarditis
    • J11.83 Influenza due to unidentified influenza virus with otitis media
    • J11.89 Influenza due to unidentified influenza virus with other manifestations
  • L44
    • L44.4 Infantile papular acrodermatitis [Gianotti-Crosti]
  • T88.1
    • T88.1XXA Other complications following immunization, not elsewhere classified, initial encounter