2,667 codes
Unacceptable principal diagnosis codes
Codes that describe a circumstance influencing health status rather than a current illness, so they are unacceptable as the principal diagnosis for an inpatient stay. Source: Medicare Code Editor (MCE) v44, effective October 1, 2026.
Chapter 1: Certain infectious and parasitic diseases
- B95.0Streptococcus, group A, as the cause of diseases classified elsewhere
- B95.1Streptococcus, group B, as the cause of diseases classified elsewhere
- B95.2Enterococcus as the cause of diseases classified elsewhere
- B95.3Streptococcus pneumoniae as the cause of diseases classified elsewhere
- B95.4Other streptococcus as the cause of diseases classified elsewhere
- B95.5Unspecified streptococcus as the cause of diseases classified elsewhere
- B95.61Methicillin susceptible Staphylococcus aureus infection as the cause of diseases classified elsewhere
- B95.62Methicillin resistant Staphylococcus aureus infection as the cause of diseases classified elsewhere
- B95.7Other staphylococcus as the cause of diseases classified elsewhere
- B95.8Unspecified staphylococcus as the cause of diseases classified elsewhere
- B96.0Mycoplasma pneumoniae [M. pneumoniae] as the cause of diseases classified elsewhere
- B96.1Klebsiella pneumoniae [K. pneumoniae] as the cause of diseases classified elsewhere
- B96.20Unspecified Escherichia coli [E. coli] as the cause of diseases classified elsewhere
- B96.21Shiga toxin-producing Escherichia coli [E. coli] [STEC] O157 as the cause of diseases classified elsewhere
- B96.22Other specified Shiga toxin-producing Escherichia coli [E. coli] [STEC] as the cause of diseases classified elsewhere
- B96.23Unspecified Shiga toxin-producing Escherichia coli [E. coli] [STEC] as the cause of diseases classified elsewhere
- B96.29Other Escherichia coli [E. coli] as the cause of diseases classified elsewhere
- B96.3Hemophilus influenzae [H. influenzae] as the cause of diseases classified elsewhere
- B96.4Proteus (mirabilis) (morganii) as the cause of diseases classified elsewhere
- B96.5Pseudomonas (aeruginosa) (mallei) (pseudomallei) as the cause of diseases classified elsewhere
- B96.6Bacteroides fragilis [B. fragilis] as the cause of diseases classified elsewhere
- B96.7Clostridium perfringens [C. perfringens] as the cause of diseases classified elsewhere
- B96.81Helicobacter pylori [H. pylori] as the cause of diseases classified elsewhere
- B96.82Vibrio vulnificus as the cause of diseases classified elsewhere
- B96.83Acinetobacter baumannii as the cause of diseases classified elsewhere
- B96.89Other specified bacterial agents as the cause of diseases classified elsewhere
- B97.0Adenovirus as the cause of diseases classified elsewhere
- B97.10Unspecified enterovirus as the cause of diseases classified elsewhere
- B97.11Coxsackievirus as the cause of diseases classified elsewhere
- B97.12Echovirus as the cause of diseases classified elsewhere
- B97.19Other enterovirus as the cause of diseases classified elsewhere
- B97.21SARS-associated coronavirus as the cause of diseases classified elsewhere
- B97.29Other coronavirus as the cause of diseases classified elsewhere
- B97.30Unspecified retrovirus as the cause of diseases classified elsewhere
- B97.31Lentivirus as the cause of diseases classified elsewhere
- B97.32Oncovirus as the cause of diseases classified elsewhere
- B97.33Human T-cell lymphotrophic virus, type I [HTLV-I] as the cause of diseases classified elsewhere
- B97.34Human T-cell lymphotrophic virus, type II [HTLV-II] as the cause of diseases classified elsewhere
- B97.35Human immunodeficiency virus, type 2 [HIV 2] as the cause of diseases classified elsewhere
- B97.39Other retrovirus as the cause of diseases classified elsewhere
- B97.4Respiratory syncytial virus as the cause of diseases classified elsewhere
- B97.5Reovirus as the cause of diseases classified elsewhere
- B97.6Parvovirus as the cause of diseases classified elsewhere
- B97.7Papillomavirus as the cause of diseases classified elsewhere
- B97.81Human metapneumovirus as the cause of diseases classified elsewhere
- B97.89Other viral agents as the cause of diseases classified elsewhere