N73.0 Acute parametritis and pelvic cellulitis

The ICD-10-CM code for Acute parametritis and pelvic cellulitis is N73.0 (FY2026). It is a billable, claim-ready diagnosis code.

Classification

Chapter

14: Diseases of the genitourinary system (N00-N99)

Section

N70-N77: Inflammatory diseases of female pelvic organs (N70-N77)

Category N73

10 codes (9 billable)

FY2026 Status

Stable since FY2024

Also Known As

ICD-10-CM Alphabetic Index entries that lead to N73.0:

• Parametritis › acute
• Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) › suprapelvic, acute
• Inflammation, inflamed, inflammatory (with exudation) › parametrium
• Inflammation, inflamed, inflammatory (with exudation) › Douglas' cul-de-sac or pouch (chronic)
• Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) › broad ligament › acute
• Cellulitis (diffuse) (phlegmonous) (septic) (suppurative) › broad ligament › acute
• Cellulitis (diffuse) (phlegmonous) (septic) (suppurative) › Douglas' cul-de-sac or pouch › acute
• Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic) › parametric, parametrium › acute

Inclusion Terms

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

U.S. Hospital Utilization

• An estimated 3,275 U.S. inpatient stays in 2023 included N73.0 among the documented diagnoses.
• 1,270 stays listed it as the principal diagnosis.

Source: National Inpatient Sample (NIS), Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality, 2016–2023. National survey-weighted estimates.

Official Coding Guidelines

CKD staging and code assignment (N18.-)

The ICD-10-CM classifies CKD based on severity. The severity of CKD is designated by stages 1-5. Stage 2, code N18.2, equates to mild CKD; stage 3, codes N18.30-N18.32, equate to moderate CKD; and stage 4, code N18.4, equates to severe CKD. Code N18.6, End stage renal disease (ESRD), is assigned when the provider has documented end- stage renal disease (ESRD).

CKD stage plus ESRD: assign N18.6 only

If both a stage of CKD and ESRD are documented, assign code N18.6 only.

Source: CMS — ICD-10-CM Official Guidelines for Coding and Reporting, FY2026

References

• CMS — ICD-10-CM Official Code Set and Guidelines, FY2026
• CDC/NCHS — ICD-10-CM Files and Browser Tool
• AHRQ — HCUP National Inpatient Sample, Frequencies by Diagnosis Code (2016–2023)