As of Oct. 1, 2013, claims submitted in the United States must use ICD-10 codes and insurers will reject claims with ICD-9 codes. So what happens if a claim for treatment crosses the ICD-10 implementation date, with ICD-9 codes effective for services on Sept. 30 and earlier, and ICD-10 codes effective starting Oct. 1?

That's the subject of new guidance from the Centers for Medicare and Medicaid Services on its Medicare Learning Network Web site at "In some cases, depending on the policies associated with those services, there cannot be a break in service or time (i.e., anesthesia) although the new ICD-10 codes set must be used effective October 1, 2013," CMS notes in the guidance.

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