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2026 CBCS EXAM PREP

2026 ICD-10-CM CHAPTER STRUCTURE 1-22

CODE RANGETITLE
ICD-10-CM CHAPTER STRUCTURE (** very high yield)
CH 1** A00-B99 CERTAIN INFECTIOUS AND PARASITIC DISEASES
CH 2** C00-D49 NEOPLASMS
CH 3 D50-D89 DISEASES OF THE BLOOD AND BLOOD-FORMING ORGANS
CH 4** E00-E89 ENDOCRINE, NUTRITIONAL, AND METABOLIC DISEASES
CH 5 F01-F99 MENTAL, BEHAVIORAL, AND NEURODEVELOPMENTAL DISORDERS
CH 6 G00-G99 DISEASES OF THE NERVOUS SYSTEM
CH 7 H00-H59 DISEASES OF THE EYE AND ADNEXA
CH 8 H60-H95 DISEASES OF THE EAR AND MASTOID PROCESS
CH 9** I00-I99 DISEASES OF THE CIRCULATORY SYSTEM
CH 10** J00-J99 DISEASES OF THE RESPIRATORY SYSTEM
CH 11** K00-K95 DISEASES OF THE DIGESTIVE SYSTEM
CH 12 L00-L99 DISEASES OF THE SKIN AND SUBCUTANEOUS TISSUE
CH 13** M00-M99 DISEASES OF THE MUSCULOSKELETAL SYSTEM AND CONNECTIVE TISSUE
CH 14 N00-N99 DISEASES OF THE GENITOURINARY SYSTEM
CH 15 O00-O9A PREGNANCY, CHILDBIRTH, AND THE PUERPERIUM
CH 16 P00-P96 CERTAIN CONDITIONS ORIGINATING IN THE PERINATAL PERIOD
CH 17 Q00-Q99 CONGENITAL MALFORMATIONS, DEFORMATIONS, AND CHROMOSOMAL ABNORMALITIES
CH 18** R00-R99 SYMPTOMS, SIGNS, AND ABNORMAL CLINICAL AND LABORATORY FINDINGS
CH 19** S00-T88 INJURY, POISONING, AND CERTAIN OTHER CONSEQUENCES OF EXTERNAL CAUSES
CH 20 V00-Y99 EXTERNAL CAUSES OF MORBIDITY
CH 21** Z00-Z99 FACTORS INFLUENCING HEALTH STATUS AND CONTACT WITH HEALTH SERVICES
CH 22 U00-U85 CODES FOR SPECIAL PURPOSES
Created by: C to the C
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