Is N64.89 a billable ICD-10-CM code?

Yes. N64.89 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does N64.89 sit in the tabular list?

Diseases of the genitourinary system (N00-N99), in the block Disorders of breast (N60-N65).

N64.89

N64.89 — Other specified disorders of breast

Billable / specific codeICD-10-CM

N64.89 is a billable, specific ICD-10-CM code for other specified disorders of breast. It is valid for submission on a claim.

Inclusion terms

Alternative wordings a physician may use in the chart for this same code.

Galactocele
Subinvolution of breast (postlactational)

Risk adjustment

N64.89 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.

Medicare coverage

N64.89 is named in 5 Medicare coverage policies — 5 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A52849Billing and Coding: Breast Imaging: Breast Echography (Sonography)/Breast MRI/Ductography
A56448Billing and Coding: Breast Imaging Mammography/Breast Echography (Sonography)/Breast MRI/Ductography
A56448Billing and Coding: Breast Imaging Mammography/Breast Echography (Sonography)/Breast MRI/Ductography
A56580Billing and Coding: Computerized Axial Tomography (CT), Thorax

How N64.89 is indexed

Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to N64.89.

Galactocele(breast)
Cyst›milk
Deformity›breast(acquired)
Degeneration, degenerative›breast
Degeneration, degenerative›nipple
Hematoma›breast(nontraumatic)
Infarct, infarction›breast
Mastopathy, mastopathia›estrogenic, oestrogenica, oestrogenic
Mastopathy, mastopathia›ovarian origin
Occlusion, occluded›mammary duct
Pendulous›breast
Subinvolution›breast(postlactational) (postpuerperal)

Related codes at this level

Codes that share N64.8. If N64.89 is not quite right, the correct code is usually one of these.

Questions about N64.89

Is N64.89 a billable ICD-10-CM code?: Yes. N64.89 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does N64.89 sit in the tabular list?: Diseases of the genitourinary system (N00-N99), in the block Disorders of breast (N60-N65).