A00-B99114 V28 risk-adjusting codes
Certain infectious and parasitic diseases
ICD-10-CM Chapter 1 (A00-B99) in the FY2026 code set. 114 codes in this chapter map to a CMS-HCC V28 payment category, across 13 HCC categories.
CMS-HCC V28 categories in this chapter (13)
Open any category for its full member-code list, RAF, and hierarchy.
- HCC 6 Opportunistic Infections37
- HCC 2 Septicemia, Sepsis, Systemic Inflammatory Response Syndrome/Shock33
- HCC 92 Bone/Joint/Muscle/Severe Soft Tissue Infections/Necrosis17
- HCC 127 Dementia, Mild or Unspecified10
- HCC 65 Chronic Hepatitis5
- HCC 182 Spinal Cord Disorders/Injuries3
- HCC 227 Cardiomyopathy/Myocarditis2
- HCC 1 HIV/AIDS2
- HCC 283 Empyema, Lung Abscess1
- HCC 263 Atherosclerosis of Arteries of the Extremities with Ulceration or Gangrene1
- HCC 282 Aspiration and Specified Bacterial Pneumonias1
- HCC 78 Intestinal Obstruction/Perforation1
- HCC 280 Chronic Obstructive Pulmonary Disease, Interstitial Lung Disorders, and Other Chronic Lung Disorders1
Risk-adjusting ICD-10-CM codes (114)
Codes in this chapter that map to a CMS-HCC V28 payment category. Open any code for its full detail.
- A01.04Typhoid arthritis
- A01.05Typhoid osteomyelitis
- A02.1Salmonella sepsis
- A02.23Salmonella arthritis
- A02.24Salmonella osteomyelitis
- A06.5Amebic lung abscess
- A07.2Cryptosporidiosis
- A20.7Septicemic plague
- A22.7Anthrax sepsis
- A26.7Erysipelothrix sepsis
- A31.0Pulmonary mycobacterial infection
- A31.2Disseminated mycobacterium avium-intracellulare complex (DMAC)
- A32.7Listerial sepsis
- A36.81Diphtheritic cardiomyopathy
- A39.2Acute meningococcemia
- A39.3Chronic meningococcemia
- A39.4Meningococcemia, unspecified
- A39.83Meningococcal arthritis
- A39.84Postmeningococcal arthritis
- A40.0Sepsis due to streptococcus, group A
- A40.1Sepsis due to streptococcus, group B
- A40.3Sepsis due to Streptococcus pneumoniae
- A40.8Other streptococcal sepsis
- A40.9Streptococcal sepsis, unspecified
- A41.01Sepsis due to Methicillin susceptible Staphylococcus aureus
- A41.02Sepsis due to Methicillin resistant Staphylococcus aureus
- A41.1Sepsis due to other specified staphylococcus
- A41.2Sepsis due to unspecified staphylococcus
- A41.3Sepsis due to Hemophilus influenzae
- A41.4Sepsis due to anaerobes
- A41.50Gram-negative sepsis, unspecified
- A41.51Sepsis due to Escherichia coli [E. coli]
- A41.52Sepsis due to Pseudomonas
- A41.53Sepsis due to Serratia
- A41.54Sepsis due to Acinetobacter baumannii
- A41.59Other Gram-negative sepsis
- A41.81Sepsis due to Enterococcus
- A41.89Other specified sepsis
- A41.9Sepsis, unspecified organism
- A42.7Actinomycotic sepsis
- A48.0Gas gangrene
- A48.1Legionnaires' disease
- A48.3Toxic shock syndrome
- A50.55Late congenital syphilitic arthropathy
- A54.40Gonococcal infection of musculoskeletal system, unspecified
- A54.41Gonococcal spondylopathy
- A54.42Gonococcal arthritis
- A54.43Gonococcal osteomyelitis
- A54.49Gonococcal infection of other musculoskeletal tissue
- A54.85Gonococcal peritonitis
- A54.86Gonococcal sepsis
- A66.6Bone and joint lesions of yaws
- A69.23Arthritis due to Lyme disease
- A81.00Creutzfeldt-Jakob disease, unspecified
- A81.01Variant Creutzfeldt-Jakob disease
- A81.09Other Creutzfeldt-Jakob disease
- A81.1Subacute sclerosing panencephalitis
- A81.2Progressive multifocal leukoencephalopathy
- A81.81Kuru
- A81.82Gerstmann-Straussler-Scheinker syndrome
- A81.83Fatal familial insomnia
- A81.89Other atypical virus infections of central nervous system
- A81.9Atypical virus infection of central nervous system, unspecified
- B00.7Disseminated herpesviral disease
- B00.82Herpes simplex myelitis
- B01.12Varicella myelitis
- B02.24Postherpetic myelitis
- B06.82Rubella arthritis
- B18.0Chronic viral hepatitis B with delta-agent
- B18.1Chronic viral hepatitis B without delta-agent
- B18.2Chronic viral hepatitis C
- B18.8Other chronic viral hepatitis
- B18.9Chronic viral hepatitis, unspecified
- B20Human immunodeficiency virus [HIV] disease
- B25.0Cytomegaloviral pneumonitis
- B25.1Cytomegaloviral hepatitis
- B25.2Cytomegaloviral pancreatitis
- B25.8Other cytomegaloviral diseases
- B25.9Cytomegaloviral disease, unspecified
- B26.85Mumps arthritis
- B33.24Viral cardiomyopathy
- B37.1Pulmonary candidiasis
- B37.7Candidal sepsis
- B37.7Candidal sepsis
- B37.81Candidal esophagitis
- B42.82Sporotrichosis arthritis
- B44.0Invasive pulmonary aspergillosis
- B44.1Other pulmonary aspergillosis
- B44.2Tonsillar aspergillosis
- B44.7Disseminated aspergillosis
- B44.81Allergic bronchopulmonary aspergillosis
- B44.89Other forms of aspergillosis
- B44.9Aspergillosis, unspecified
- B45.0Pulmonary cryptococcosis
- B45.1Cerebral cryptococcosis
- B45.2Cutaneous cryptococcosis
- B45.3Osseous cryptococcosis
- B45.7Disseminated cryptococcosis
- B45.8Other forms of cryptococcosis
- B45.9Cryptococcosis, unspecified
- B46.0Pulmonary mucormycosis
- B46.1Rhinocerebral mucormycosis
- B46.2Gastrointestinal mucormycosis
- B46.3Cutaneous mucormycosis
- B46.4Disseminated mucormycosis
- B46.5Mucormycosis, unspecified
- B46.8Other zygomycoses
- B46.9Zygomycosis, unspecified
- B48.4Penicillosis
- B48.8Other specified mycoses
- B58.2Toxoplasma meningoencephalitis
- B58.3Pulmonary toxoplasmosis
- B59Pneumocystosis
- B97.35Human immunodeficiency virus, type 2 [HIV 2] as the cause of diseases classified elsewhere
Frequently asked questions
How many ICD-10-CM codes in Certain infectious and parasitic diseases risk-adjust under CMS-HCC V28?
114 ICD-10-CM codes in the A00-B99 chapter (Certain infectious and parasitic diseases) map to a CMS-HCC V28 payment category for payment year 2026.
Which CMS-HCC V28 categories do A00-B99 codes map to?
Codes in this chapter map to 13 distinct CMS-HCC V28 categories, most commonly HCC 6 (Opportunistic Infections), HCC 2 (Septicemia, Sepsis, Systemic Inflammatory Response Syndrome/Shock), HCC 92 (Bone/Joint/Muscle/Severe Soft Tissue Infections/Necrosis).
What ICD-10-CM chapter is A00-B99?
A00-B99 is ICD-10-CM Chapter 1, Certain infectious and parasitic diseases, in the FY2026 code set.
Source: FY2026 ICD-10-CM Tabular (CDC/NCHS) and the CMS-HCC v28 PY2026 mapping file.