Cardiology Coding Alert

Tip: A diagnosis that falls under an ICD-9 'other' code may have its own ICD-10 code.

Under ICD-9, when the manual doesn't offer a code specific to your diagnosis, you usually choose one of the catch-all "other specified" codes available, such as 425.4 (Other primary cardiomyopathies). When you start applying ICD-10 codes in October 2013, you may find that your catch-all code has been divided into more specific options. Here's how the ICD-10 counterparts for 425.4 will look.

ICD-9 coding rules: Cardiomyopathy literally means disease of the heart muscle and can refer to many types of heart disease. ICD-9 offers one code for "other" primary cardiomyopathies: 425.4. It's appropriate for cardiomyopathy NOS, congestive, constrictive, familial, hypertrophic, idiopathic, nonobstructive, obstructive (but see 425.1 for hypertrophic obstructive), and restrictive. Code 425.4 is also appropriate for cardiovascular collagenosis.

ICD-10 changes: ICD-10 divides your options for "other" cardiomyopathy among three codes:

• I42.2, Other hypertrophic cardiomyopathy
• I42.5, Other restrictive cardiomyopathy
• I42.8, Other cardiomyopathies.

Code I42.2 will be appropriate for other cardiomyopathy: hypertrophic, nonobstructive. Code I42.5 will be appropriate for other cardiomyopathy: restrictive, constrictive NOS. Code I42.8 is appropriate for any other cardiomyopathies not listed elsewhere, including newborn and obscure of Africa, as well as cardiovascular collagenosis.

Caution: Check the index and full I42.- range in the tabular list before choosing an "other" code. For example, several of the diagnoses that fall under 425.4 in ICD-9 do not fall under the "other" cardiomyopathy codes in ICD- 10. Specifically, obstructive cardiomyopathy is coded to I42.1 under ICD-10, congestive falls under I42.0, and familial and idiopathic fall under I42.9.

Remember: When ICD-10 goes into effect on Oct. 1, 2013, you should apply the code set and official guidelines in effect for the date of service reported. Learn more at www.cms.gov/ICD10/ and www.cdc.gov/nchs/icd/icd10cm.htm#10update.