Comparison with ICD-9-CM

The new classification system provides significant improvements through greater detailed information and the ability to expand in order to capture additional advancements in clinical medicine.

ICD-10-CM Incorporates much greater specificity and clinical information that results in:

  • Improved ability to measure health care services;
  • Increased sensitivity when refining grouping
  • Reimbursement methodologies;
  • Enhanced ability to conduct public health surveillance
  • Decreased need to include supporting documentation with claims;
  • Includes updated medical terminology and classification of diseases;
  • Provides codes to allow comparison of mortality and morbidity data
  • Provides better data for measuring care furnished to patients;
  • Provides better data for designing payment systems
  • Provides better data for quicker claim processing

Please see the highlights of major comparison of ICD-10-CM with ICD-9-CM

Comparison with ICD-9-CM
3-5 characters in length 3-7 characters in length
Approximately 14,025 codes Approximately 70,000 codes
First digit may be alpha (V or E) or numeric, digits 2-5 are numeric First digit is alpha, digits 2-3 are numeric, digits 4-7 are alpha or alphanumeric
Limited space for adding new codes Flexible for adding new codes
No dummy placeholder There is a new dummy placeholder character “X”
Lacks clarity on laterality Has laterality, codes are identifying right Vs left
Late effect is gone Sequela is introduced
Hypertension table No Htn table anymore, only combination code for HTN
Lacks Details Very Specific
17 Chapters 21 Chapters


Chapter ICD-9-CM ICD-10-CM
1 Infectious and Parasitic Diseases (001-139) Certain Infectious and Parasitic Diseases (A00-B99)
2 Neoplasm (140-239) Neoplasms (C00-D49)
3 Endocrine, Nutritional, Metabolic Diseases, and Immunity Disorders (240-279) Diseases of Blood and Blood-Forming Organs and Certain Disorders Involving Immune Mechanism (D50-D89)
4 Diseases of the Blood and Blood-Forming Organs (280-289) Endocrine, Nutritional, and Metabolic Disorders (E00-E90)
5 Mental, Behavioral, and Neurodevelopmental Disorders (290-319) Mental, Behavioral, and Neurodevelopmental Disorders (F01-F99)
6 Diseases of Nervous System and Sense Organs (320-389) Diseases of Nervous System (G00-G99)
7 Diseases of Circulatory System (390-459) Diseases of Eye and Adnexa (H00-H59)
8 Diseases of Respiratory System (460-519) Diseases of Ear and Mastoid Process (H60-H95)
9 Diseases of Digestive System (520-579) Diseases of Circulatory System (I00-I99)
10 Diseases of Genitourinary System (580-629) Diseases of Respiratory System (J00-J99)
11 Complications of Pregnancy, Childbirth, and the Puerperium (630-679) Diseases of Digestive System (K00-K95)
12 Diseases of the Skin and Subcutaneous Tissue (680-709) Diseases of Skin and Subcutaneous Tissue (L00-L99)
13 Diseases of the Muskuloskeletal System and Connective Tissue (710-739) Diseases of the Muskuloskeletal System and Connective Tissue (M00-M99)
14 Congenital Anomalies (740-759) Diseases of Genitourinary System (N00-N99)
15 Certain Conditions Originating in the Perinatal Period (760-779) Pregnancy, Childbirth, and the Puerperium (O00-09A)
16 Symptoms, Signs, and ill Defined Conditions (780-799) Certain Conditions Originating in the Perinatal Period (P00-P96)
17 Injury and Poisoning (800-999) Congenital Malformations, Deformations, and Chromosomal Abnormalities (Q00-Q99)
18 N/A Symptoms, Signs, and Abnormal Clinical and Laboratory Findings, NEC (R00-R99)
19 N/A Injury, Poisoning, and Certain Other Consequences of External Causes (S00-T88)
20 N/A External Causes of Morbidity (V00-Y99)
21 N/A Factors Influencing Health Status and Contact with Health Services (Z00-Z99)