DxCodebookFY2027 · Oct 1, 2026 – Sep 30, 2027

Category · FY2027

N64 Other disorders of breast

  • Header · not billable

N64 is not billable. The category heads 13 billable codes in FY2027, grouped under 8 subdivisions.

Index → code

Where it sits

  1. Chapter 14 Diseases of the genitourinary system (N00-N99)
  2. N60-N65 Disorders of breast (N60-N65)
  3. N64 Other disorders of breast
Billable codes
13
Subdivisions
8
CC / MCC codes
0 / 0
HCC V28 codes
0
New FY2027
0
Index entries
48

Codes in N64

  1. N64.0
    Fissure and fistula of nipple
    Billable
  2. N64.1
    Fat necrosis of breast
    Billable
    Inclusion terms 1, Code first 1

    Inclusion terms

    • Fat necrosis (segmental) of breast

    Code first

    • breast necrosis due to breast graft (T85.898) T85.898
  3. N64.2
    Atrophy of breast
    Billable
  4. N64.3
    Galactorrhea not associated with childbirth
    Billable
  5. N64.4
    Mastodynia
    Billable
  6. N64.5
    Other signs and symptoms in breast
    Header
    Excludes2 1

    Excludes2

    • abnormal findings on diagnostic imaging of breast (R92.-) R92
  7. N64.51
    Induration of breast
    Billable
  8. N64.52
    Nipple discharge
    Billable
    Excludes1 1

    Excludes1

    • abnormal findings in nipple discharge (R89.-) R89
  9. N64.53
    Retraction of nipple
    Billable
  10. N64.59
    Other signs and symptoms in breast
    Billable
  11. N64.8
    Other specified disorders of breast
    Header
  12. N64.81
    Ptosis of breast
    Billable
    Excludes1 1

    Excludes1

    • ptosis of native breast in relation to reconstructed breast (N65.1) N65.1
  13. N64.82
    Hypoplasia of breast
    Billable
    Inclusion terms 1, Excludes1 2

    Inclusion terms

    • Micromastia

    Excludes1

    • congenital absence of breast (Q83.0) Q83.0
    • hypoplasia of native breast in relation to reconstructed breast (N65.1) N65.1
  14. N64.89
    Other specified disorders of breast
    Billable
    Inclusion terms 2

    Inclusion terms

    • Galactocele
    • Subinvolution of breast (postlactational)
  15. N64.9
    Disorder of breast, unspecified
    Billable

Sources of each column.

Instructions

At N64

Excludes2

  • mechanical complication of breast prosthesis and implant (T85.4-) T85.4

Notes that also apply

Block N60-N65 instructions (Excludes1 1): printed on the block page.

Chapter 14 instructions (Excludes2 8): printed on the chapter 14 page.

Index entries

  • Cracked nipple → N64.0
  • Mastalgia → N64.4
  • Mastodynia → N64.4
  • Micromastia → N64.82
  • Galactocele (breast) → N64.89
  • Mastopathy, mastopathia → N64.9
  • Fissure, fissurednipple → N64.0
  • Fistula (cutaneous)nipple → N64.0
  • Necrosis, necrotic (ischemic)breast (aseptic) (fat) (segmental) → N64.1
  • Necrosis, necrotic (ischemic)mammary gland (fat) (segmental) → N64.1
  • Atrophy, atrophic (of)breast → N64.2
  • Galactorrheanot associated with childbirth → N64.3
  • Lactation, lactating (breast) (puerperal, postpartum)nonpuerperal → N64.3
  • Pain(s)breast → N64.4
  • Induration, induratedbreast (fibrous) → N64.51
  • Discharge (from)breast (female) (male) → N64.52
  • Discharge (from)nipple → N64.52
  • Retractionnipple → N64.53
  • Bleedingnipple → N64.59
  • Congestion, congestivebreast → N64.59
  • Engorgementbreast → N64.59
  • Hemorrhage, hemorrhagic (concealed)breast → N64.59
  • Hemorrhage, hemorrhagic (concealed)nipple → N64.59
  • Inversionnipple → N64.59
  • Symptoms NECbreast NEC → N64.59
  • Thickeningbreast → N64.59
  • Ptosisbreast → N64.81
  • Hypoplasia, hypoplasticbreast (areola) → N64.82
  • Cyst (colloid) (mucous) (simple) (retention)milk → N64.89
  • Deformitybreast (acquired) → N64.89
  • Degeneration, degenerativebreast → N64.89
  • Degeneration, degenerativenipple → N64.89
  • Hematoma (traumatic) (skin surface intact)breast (nontraumatic) → N64.89
  • Infarct, infarctionbreast → N64.89
  • Mastopathy, mastopathiaestrogenic, oestrogenica, oestrogenic → N64.89
  • Mastopathy, mastopathiaovarian origin → N64.89
  • Occlusion, occludedmammary duct → N64.89
  • Pendulousbreast → N64.89
  • Subinvolutionbreast (postlactational) (postpuerperal) → N64.89
  • Unilateraldevelopment, breast → N64.89

8 more, longer entries are not listed; the search box finds them by word.

NCHS Alphabetic Index. Index first, then the Tabular List.

Hierarchy