2027 ICD-10-CM Diagnosis Code N73.0Acute parametritis and pelvic cellulitis

ICD-10-CM Codes›N00–N99›N70-N77›N73

ICD-10-CM N73.0
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

N73.0 is a billable ICD-10-CM diagnosis code for acute parametritis and pelvic cellulitis. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 742 through 743, 757 through 759. As a secondary diagnosis, it counts as a complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 67 closely related codes. Coders also document this condition as acute cellulitis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Inflammatory diseases of female pelvic organs.

Code Identity

ICD-10-CM Code
N73.0
Billable Status
Yes — Valid for Submission
Code Describes
Acute parametritis and pelvic cellulitis
Short Description
Acute parametritis and pelvic cellulitis
Same as the full description in the CMS dataset.
Parent Code
N73
Other female pelvic inflammatory diseases

Code Classification

ChapterN00–N99Diseases of the genitourinary system
SectionN70-N77Inflammatory diseases of female pelvic organs
CategoryN73Other female pelvic inflammatory diseases
This CodeN73.0Acute parametritis and pelvic cellulitis

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Acute cellulitis
  • Acute female pelvic cellulitis
  • Acute parametritis
  • Female pelvic cellulitis
  • Parametritis

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to N73.0: its own notes plus those printed at N73, block N70-N77, and Chapter 14. A note printed at a category, block or chapter applies to every code under it.

Applicable To

Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.

  • Abscess of broad ligament
  • Abscess of parametrium
  • Pelvic cellulitis, female

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

From Block N70-N77 Inflammatory diseases of female pelvic organs applies to 39 codes
  • inflammatory diseases of female pelvic organs complicating:
  • abortion or ectopic or molar pregnancy (O00-O07, O08.0)
  • pregnancy, childbirth and the puerperium (O23.-, O75.3, O85, O86.-)

Excludes2

Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.

From Chapter 14 (N00-N99) Diseases of the genitourinary system applies to 838 codes
  • certain conditions originating in the perinatal period (P04-P96)
  • certain infectious and parasitic diseases (A00-B99)
  • complications of pregnancy, childbirth and the puerperium (O00-O9A)
  • 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)
  • symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified (R00-R94)

Use Additional Code

Add a second code, after this one, to fully describe the condition.

From N73 Other female pelvic inflammatory diseases applies to 9 codes
  • code (B95-B97), to identify infectious agent.

Code Also

A second code may be needed to fully describe the condition; the note gives no sequencing direction.

From Block N70-N77 Inflammatory diseases of female pelvic organs applies to 39 codes
  • if applicable, pelvic abscess (K6A.0-)

Source: CMS ICD-10-CM Tabular List. How to read instructional notes.

Referenced in Other NotesGuidance

Instructional notes printed at other codes that name N73.0, its category, or a range that includes it.

Applicable To 2

These notes mention N73.0.

  • N73.1 Chronic parametritis and pelvic cellulitis
    Any condition in N73.0 specified as chronic
  • N73.2 Unspecified parametritis and pelvic cellulitis
    Any condition in N73.0 unspecified whether acute or chronic

Code Also 1

These codes say N73.0 may also be needed to fully describe the condition. The note gives no sequencing direction.

  • K6A.0 Pelvic abscess
    female pelvic inflammatory disease (N73.-) names N73.-, which includes this code

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR GEN018
Inflammatory diseases of female pelvic organs
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Cellulitis

Cellulitis is an infection of the skin and deep underlying tissues. Group A strep (streptococcal) bacteria are the most common cause. The bacteria enter your body when you get an injury such as a bruise, burn, surgical cut, or wound.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert N73.0 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
614.3 Acute parametritis
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

Questions About N73.0Overview

What is the ICD-10 code for acute parametritis and pelvic cellulitis?

The ICD-10-CM code for acute parametritis and pelvic cellulitis is N73.0 (sometimes written as N730). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

Is N73.0 (Other female pelvic inflammatory diseases) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report acute parametritis and pelvic cellulitis on HIPAA-covered claims from October 1, 2026 through September 30, 2027.

What MS-DRG does N73.0 group to?

When acute parametritis and pelvic cellulitis is the principal diagnosis on an inpatient stay, it groups to MS-DRG 742, 759, 743, 758, 757, with relative weights from 0.7687 to 1.8448 depending on complications. Higher weights mean higher Medicare reimbursement.

Is N73.0 a CC or MCC?

CMS lists N73.0 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 67 closely related codes in its exclusion list.

Can N73.0 be reported with O08.0?

Not as a rule. The Excludes1 note at block N70-N77, which applies to N73.0, lists "abortion or ectopic or molar pregnancy (O00-O07, O08.0)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).