N60.4 – Mammary duct ectasia

ICD-10-CM 2027 diagnosis code · Disorders of breast

Non-billable header

ICD-10-CM code N60.4

Code: N60.4 (claims format: N604)
Description: Mammary duct ectasia
Billable: No – use a more specific code below
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 14. Diseases of the genitourinary system (N00-N99)
Block: N60-N65 Disorders of breast
Parent codes: N60

Billable codes under N60.4

N60.4 is a header code and cannot be used on claims. Choose the most specific code:

N60.41 – Mammary duct ectasia of right breastBillable
N60.42 – Mammary duct ectasia of left breastBillable
N60.49 – Mammary duct ectasia of unspecified breastBillable

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

N60 – Benign mammary dysplasia

Includes:

fibrocystic mastopathy

Block N60-N65

Excludes1 (not coded here):

disorders of breast associated with childbirth (O91-O92)

Index terms for N60.4

Entries in the ICD-10-CM alphabetic index that lead to this code:

Ectasia, ectasis, mammary duct

Related codes in N60

N60.0 – Solitary cyst of breastHeader
N60.1 – Diffuse cystic mastopathyHeader
N60.2 – Fibroadenosis of breastHeader
N60.3 – Fibrosclerosis of breastHeader
N60.8 – Other benign mammary dysplasiasHeader
N60.9 – Unspecified benign mammary dysplasiaHeader

Frequently asked questions

What is ICD-10 code N60.4?

N60.4 is the ICD-10-CM code for mammary duct ectasia, in the block N60-N65 (Disorders of breast).

Is N60.4 a billable code?

No. N60.4 is a header code with more specific child codes; report one of the billable codes listed above.

What category does N60.4 belong to?

It belongs to category N60 – Benign mammary dysplasia.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.