M22.42
Billable codeChondromalacia patellae, left knee
The ICD-10 code for chondromalacia patellae, left knee is M22.42.
Documentation support
General coding-documentation guidance — not a substitute for payer-specific requirements or professional coding judgment.
- •As a general rule, code to the highest level of specificity supported by the documentation in the medical record.
Related codes in this category
- M22.40Chondromalacia patellae, unspecified knee
- M22.41Chondromalacia patellae, right knee
- M22.42Chondromalacia patellae, left knee
ICD-9-CM equivalent
Informational only — GEM mappings are approximate, not guaranteed one-to-one equivalents. Verify before use in billing.
- 7177Approximate match
Associated MS-DRGs
M22.42 can serve as the principal diagnosis for these Medicare Severity Diagnosis-Related Groups.
Informational only — actual DRG assignment also depends on procedures, complications/comorbidities (CC/MCC), discharge status, and payer-specific rules not reflected here.