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M17.12, unilateral primary osteoarthritis, left kneeĮditor’s note: Adrienne Commeree, CPC, CPMA, CCS, CEMC, CPIP, RHIA, lead medical coding specialist at the Washington State Health Care Authority located in Olympia, Washington, and adjunct coding instructor at Tacoma Community College located in Tacoma, Washington, answered this question.M17.11, unilateral primary osteoarthritis, right knee.M17.10, unilateral primary osteoarthritis, unspecified knee.Per Coding Clinic, Fourth Quarter 2016, when the type of OA is not specified, “primary” is the default, as it is the most common form.įor example, ICD-10-CM codes for unilateral, primary OA of the knees can be identified with the following: Primary OA is caused by aging and secondary OA is caused by other conditions such as avascular necrosis. Bilateral OA of the same site is considered localized, where generalized OA affects multiple joints. When coding OA, review the medical records to determine whether the OA is localized or generalized and if it’s primary or secondary.

If the arthritis is ever in the spine, refer to category M47, Spondylosis.

This is the most common type of arthritis in the elderly. How can we determine primary versus secondary OA, and how would it be reported in ICD-10-CM?Ī: OA, or degenerative joint disease, is identified in categories M15-M19 of the ICD-10-CM manual. Since we don’t report OA very often, we are having trouble determining if we should code primary or secondary OA. Q: We have an elderly patient admitted to our hospital who is also presenting with osteoarthritis (OA) of the right knee.