OASIS Alert

ICD-10:

Don't Let This ICD-10 Crosswalk Quirk Trip You Up -- Bone Up On Osteoarthrosis coding

Hint: Specifics like unilateral, bilateral, and post-traumatic will help you nail this diagnosis.

When ICD-9 becomes ICD-10 in 2013, you will not always have a simple crosswalk relationship between old codes and new ones. Often, you'll have more options that may require documentation and coding tweaks. Check out the following example of how ICD-10 will change your coding options when the calendar turns to Oct. 1, 2013. Suppose a patient is diagnosed with osteoarthrosis (715. xx-716. xx). The ICD-9 codes you would list in M1020 or M1022 specify location, primary, or secondary.

ICD-10 difference: Once Oct. 1, 2013 rolls around, you should look to:

  • M15 (Polyosteoarthritis)
  • M16 (Osteoarthritis of hip)
  • M17 (Osteoarthritis of knee)
  • M18 (Osteoarthritis of first carpometacarpal joint)
  • M19 (Other and unspecified osteoarthritis).

These ICD-10 codes you will list in M1020 or M1022 come 2013 are broken down into location, primary, and secondary like ICD-9 codes, but they also sometimes specify unilateral, bilateral, and posttraumatic indications.

Coder tips: Notice how codes M19.01-M19.93 entail unspecified locations. ICD-10 no longer groups unspecified locations alongside the specific locations for each type (as in, the familiar .9 code in most ICD-9 categories). You will find them at the end of the code grouping (M19.90-M19.93) for each specific type but in an unspecified location.

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