ICDcodes.org
FY2027

P39.0 — Neonatal infective mastitis

BillableCC

Is P39.0 billable?

Yes — P39.0 is billable for FY2027. P39.0 is a valid, billable ICD-10-CM code at the highest level of specificity in its branch. P39.0 may be submitted for encounters from October 1, 2026 through September 30, 2027.

P39.0 at a glance

CodeP39.0
DescriptionNeonatal infective mastitis
BillableYes
Code setICD-10-CM FY2027
Valid for encountersOctober 1, 2026 – September 30, 2027

Which MS-DRGs does P39.0 group to?

P39.0 sits in MDC 15 and helps define the logic of 1 MS-DRG (version 44, FY2027). Which one a stay actually groups to also depends on procedures and secondary diagnoses.

  • 791Prematurity with Major Problemsmedical

As a secondary diagnosis, P39.0 is a complication or comorbidity (CC), which can move a stay into a higher-paying DRG.

How is P39.0 listed in the Alphabetic Index?

These are the routes through the Alphabetic Index that lead to P39.0. They show the wording a clinician may have documented, which often differs from the Tabular description.

  • Newborn › mastitis (infant) (liveborn) (singleton)
  • Abscess › breast › newborn (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic)
  • Mastitis › infective › newborn (acute) (diffuse) (nonpuerperal) (subacute)
  • Mastitis › neonatal › infective (acute) (diffuse) (nonpuerperal) (subacute)
  • Newborn › mastitis › infective (infant) (liveborn) (singleton)

Excludes1 — never code together

The conditions below can never be reported together with P39.0 on the same claim. An Excludes1 note means the two conditions cannot occur in the same patient, so reporting both is a coding error.

  • breast engorgement of newborn (P83.4)
  • noninfective mastitis of newborn (P83.4)

Use additional code — inherited from P39

Report an additional code alongside P39.0 to fully describe the condition. P39.0 is sequenced first.

  • code to identify organism or specific infection

Excludes2 — not included here — inherited from Chapter 16

The conditions below are not part of P39.0, but a patient may have both at the same time. When documentation supports it, P39.0 and the excluded code may both be reported.

  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • tetanus neonatorum (A33)

Excludes2 — not included here — inherited from P35-P39

The conditions below are not part of P39.0, but a patient may have both at the same time. When documentation supports it, P39.0 and the excluded code may both be reported.

  • asymptomatic human immunodeficiency virus [HIV] infection status (Z21)
  • congenital gonococcal infection (A54.-)
  • congenital pneumonia (P23.-)
  • congenital syphilis (A50.-)
  • human immunodeficiency virus [HIV] disease (B20)
  • infant botulism (A48.51)
  • infectious diseases not specific to the perinatal period (A00-B99, J09, J10.-)
  • intestinal infectious disease (A00-A09)
  • laboratory evidence of human immunodeficiency virus [HIV] (R75)
  • tetanus neonatorum (A33)

How long has P39.0 existed?

P39.0 has been in ICD-10-CM since at least FY2016, the earliest fiscal year on record here.

Derived from the official order files for FY2016–FY2026. FY2017 and FY2020 publish no order file, so those years are not covered.

Which codes are confused with P39.0?

ICD-10-CM declares these codes mutually exclusive with P39.0 — exactly one of each pair can be correct for a given encounter.

Which conditions are coded to P39.0?

What other codes are in the P39 family? (6)