Why Do We Need the
General Equivalence Mappings?
* ICD-10 is much more specific:
For diagnoses, there are 14,025 ICD-9-CM codes and 68,069 ICD-10-CM codes; and
For procedures, there are 3,824 ICD-9-CM codes and 72,589 ICD-10-PCS codes (in
the 2009 versions of ICD-9-CM, ICD-10-CM, and ICD-10-PCS).
* One ICD-9-CM Diagnosis Code is represented by multiple ICD-10-CM codes:
82002 Fracture of midcervical section of femur, closed
— From S72031A Displaced midcervical fracture of right femur, initial encounter
for closed fracture
— From S72031G Displaced midcervical fracture of right femur, subsequent
encounter for closed fracture with delayed healing
— From S72032A Displaced midcervical fracture of left femur, initial encounter
for closed fracture
— From S72032G Displaced midcervical fracture of left femur, subsequent
encounter for closed fracture with delayed healing
— And other codes from the GEMs
* One ICD-10-CM Diagnosis Code is represented by multiple ICD-9-CM codes:
* E11341 Type 2 diabetes mellitus with severe nonproliferative diabetic
retinopathy
with macular edema
* To ICD-9 cluster:
— 25050 Diabetes with ophthalmic manisfestations, type II or specified type,
not
stated as uncontrolled
— 36206 Severe nonproliferative diabetic retinopathy
* A few ICD-10-CM codes have no predecessor ICD-9-CM codes:
-- T500x6A Underdosing of mineralocorticoids and their antagonists,
initial encounter
-- T501x6A Underdosing of loop [high-ceiling] diuretics, initial
encounter
-- T502x6A Underdosing of carbonic-anhydrase inhibitors, benzothiadiazides and
other
diuretics, initial encounter
-- T503x6A Underdosing of electrolytic, caloric and water-balance agents,
initial
encounter
-- T504x6A Underdosing of drugs affecting uric acid metabolism, initial
encounter-- And others found in the GEMs
* One ICD-9-CM Procedure Code captured by multiple ICD-10-PCS codes:
8659 Suture of Skin and Subcutaneous Tissue of Other Sites
— To 0JQ10ZZ Repair Face Subcutaneous Tissue and Fascia, Open Approach
— To 0JQ13ZZ Repair Face Subcutaneous Tissue and Fascia, Percutaneous Approach
— To 0JQ40ZZ Repair Anterior Neck Subcutaneous Tissue and Fascia, Open Approach
— To 0JQ43ZZ Repair Anterior Neck Subcutaneous Tissue and Fascia,
Percutaneous Approach
— And others found in the GEMs
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