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Official 2026 updates from CMS and CDC.
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Ch 1A00-B99
Certain infectious and parasitic diseases
Ch 2C00-D49
Neoplasms
Ch 3Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0)
Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0)
Ch 4D50-D89
Diseases of the blood and blood-forming organs and certain disorders involving the immune mechanism
Ch 5E00-E89
Endocrine, nutritional and metabolic diseases
Ch 6F01-F99
Mental, Behavioral and Neurodevelopmental disorders
Ch 7G00-G99
Diseases of the nervous system
Ch 8H00-H59
Diseases of the eye and adnexa
Ch 9H60-H95
Diseases of the ear and mastoid process
Ch 10I00-I99
Diseases of the circulatory system
Ch 11J00-J99
Diseases of the respiratory system
Ch 12K00-K95
Diseases of the digestive system
Ch 13L00-L99
Diseases of the skin and subcutaneous tissue
Ch 14M00-M99
Diseases of the musculoskeletal system and connective tissue
Ch 15N00-N99
Diseases of the genitourinary system
Ch 16P00-P96
Certain conditions originating in the perinatal period
Ch 17Pregnancy, childbirth and the puerperium (O00-O9A)
Pregnancy, childbirth and the puerperium (O00-O9A)
Ch 18R00-R99
Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
Ch 19S00-T88
Injury, poisoning and certain other consequences of external causes
Ch 20U00-U85
Codes for special purposes
Ch 21V00-Y99
External causes of morbidity
Ch 22Z00-Z99