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N73.1 ICD-10-CM Code: Chronic parametritis and pelvic cellulitis

Compare with another codeCheck this code on a claim

Billing Status: YES. This is a valid, specific, and billable ICD-10-CM reference.

Coding at a Glance

Tabular directives
1 inclusion term · 4 Excludes1 · 1 use-additional code · 1 code-also instruction

Billable · FY2027A valid, specific ICD-10-CM code, reportable for dates of service in FY2027.

What you need to know

Source: CMS/NCHS Official ICD-10-CM tabular notes, quoted. From the CMS/NCHS tabular list for the release in force. A note the category or block publishes applies to this code too; the Instructions section marks which is which.

Use additional codeReport with this code when documented
  • code (B95-B97), to identify infectious agent.
Excludes1Never report with this code
  • tuberculous parametritis and pelvic cellultis (A18.17)
  • 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.-)
Code alsoMay be needed with this code
  • , if applicable, pelvic abscess (K6A.0-)
IncludesWhat this code covers
  • Any condition in N73.0 specified as chronic

Most relevant related codes MedCoder-derived

Read off the official notes above and this code’s own position in the tabular list. Which to report is a documentation question; Compare shows the two side by side.

CompareCheck ClaimView Related Codes

Inpatient Payment Groups (MS-DRG)

Potential MS-DRG participation — not a DRG assignment.

MS-DRGs this diagnosis helps define, as principal or secondary, per the CMS ICD-10-CM/PCS MS-DRG Definitions Manual v44, Appendix B.

  • MS-DRG 742 — UTERINE AND ADNEXA PROCEDURES FOR NON-MALIGNANCY WITH CC/MCC (MDC 13)
  • MS-DRG 743 — UTERINE AND ADNEXA PROCEDURES FOR NON-MALIGNANCY WITHOUT CC/MCC (MDC 13)
  • MS-DRG 757 — INFECTIONS, FEMALE REPRODUCTIVE SYSTEM WITH MCC (MDC 13)
  • MS-DRG 758 — INFECTIONS, FEMALE REPRODUCTIVE SYSTEM WITH CC (MDC 13)
  • MS-DRG 759 — INFECTIONS, FEMALE REPRODUCTIVE SYSTEM WITHOUT CC/MCC (MDC 13)

A diagnosis appearing in a group's logic does not by itself determine the DRG assigned to a stay; the grouper uses the full claim.

Coding instructions

Official Tabular Instructional Notes: the inclusion, exclusion and sequencing notes published for N73.1 in the official ICD-10-CM tabular list, quoted as published.

Source: CMS/CDC — ICD-10-CM Tabular ListRelease: FY2027Effective: October 1, 2026

Trace:FY2027 changesChange historyRelease, file and checksum

Notes without a marker are published on N73.1 itself; “inherited from” names the category or block whose note applies here.

Inclusion Terms

Alternative terms the tabular list files under this code.

  • Any condition in N73.0 specified as chronic

Excludes1 — Not Coded Here

Conditions generally not reported together with this code (Excludes1) -- an error unless the two conditions are documented as unrelated to each other (ICD-10-CM Official Guidelines, Section I.A.12.a).

Code Also

Additional codes that may be required to fully describe the encounter.

  • Code also, if applicable, pelvic abscess (K6A.0-)

Source: inherited from N70-N77

Use Additional Code

Supplementary codes the tabular list directs you to add.

  • Use additional code (B95-B97), to identify infectious agent.

Source: inherited from N73

Coder workflow for N73.1

MedCoder structured workflow — derived from this code’s own official record

Before you code N73.1

  1. Check the Excludes1 note: if the documentation supports a condition named there, do not simply proceed with N73.1. Excludes1 conditions are not reported together with this code unless the record shows they are unrelated (Guidelines I.A.12.a).

    See the official tabular notes

Choose the right path

  1. Does the documentation support a condition named in N73.1’s Excludes1 note?
    Yes → Do not simply proceed: review the excluded code. Both are reported only when the record shows the two conditions are unrelated.
    No → Continue.

    ReviewA18.17, O08.0, O23, O75.3, O85, O86

Consider N73.1. Then work the Use Additional Code note and review the Code Also note, and confirm the code is valid for the date of service in the Verify section.

Documentation check

The provider’s diagnostic statement
Codes are assigned from the provider’s documented diagnosis, not from clinical criteria, test values or a medication list (Guidelines I.A.19).
Acuity
Acute or chronic as documented; when both are documented and separate codes exist, both are reported with the acute code first (Guidelines I.B.8).
The conditions the Use Additional Code note names
Reported with this code when documented; a conditional instruction (“if applicable”, “if known”) applies only when the record supports it.

Official instructions as workflow

  • Excludes1 — check before selecting N73.1(4 notes)

    Coding workflow: If the documentation supports a condition named in this note, do not simply proceed with N73.1: the two are not reported together. The one exception is when the record shows the two conditions are unrelated to each other.

    CompareA18.17, O08.0, O23, O75.3, O85, O86

    See the official tabular notes · Guidelines I.A.12.a

  • Use Additional Code — after identifying N73.1(1 note)

    Coding workflow: Check whether the documentation supports the additional code(s) the note names, and report them with N73.1 when it does. Where the instruction is conditional (“if applicable”, “if known”), it applies only when the record documents the condition.

    See the official tabular notes · Guidelines I.A.13

  • Code Also — related condition(1 note)

    Coding workflow: Review the related condition when both are documented and the instruction applies. A Code Also note does not fix sequencing; the order follows the circumstances of the encounter.

    ReviewK6A.0

    See the official tabular notes · Guidelines I.A.17

Coding decision scenarios

Pattern scenarios for this code’s structure — decision rules, not clinical cases

Documentation: Both the condition N73.1 describes and a condition named in its Excludes1 note are documented for the same encounter.

Coding question: Can both codes be reported?

Path: Review the Excludes1 note and the excluded code, and look for a provider statement on whether the two conditions are related.

Reason: Excludes1 means the two are not coded together; the exception is when the record shows the conditions are unrelated to each other (Guidelines I.A.12.a).

ReviewA18.17, O08.0, O23, O75.3, O85, O86

Documentation: A condition the Use Additional Code note names is documented.

Coding question: Is a second code reported with N73.1?

Path: Review the Use Additional Code note and the code it names.

Reason: The additional code is reported when the record documents the condition; a conditional instruction applies only when its condition is met (Guidelines I.A.13).

Every row is derived from this code’s own record — its title, tabular notes, 7th-character family and same-category siblings — with fixed MedCoder wording; nothing is inferred about a patient. The official notes and guideline text are in the sections each row links to, and they control.

Don’t confuse N73.1 with…

MedCoder analysis — pairs from this code’s official notes, distinctions written by MedCoder

The codes most likely to be picked instead of N73.1 — named in its own official notes, or sharing its laterality or encounter family — with what separates them and which documentation moves the case. Each links to the full comparison.

  • A18.17— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of tuberculous parametritis and pelvic cellultis moves the case to A18.17; the two are not reported together unless documented as unrelated.

    Full comparison: N73.1 vs A18.17 →

  • O00— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of abortion or ectopic or molar pregnancy moves the case to O00; the two are not reported together unless documented as unrelated.

    Full comparison: N73.1 vs O00 →

  • O07— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of abortion or ectopic or molar pregnancy moves the case to O07; the two are not reported together unless documented as unrelated.

    Full comparison: N73.1 vs O07 →

  • O08.0— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of abortion or ectopic or molar pregnancy moves the case to O08.0; the two are not reported together unless documented as unrelated.

    Full comparison: N73.1 vs O08.0 →

  • O23— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of pregnancy, childbirth and the puerperium moves the case to O23; the two are not reported together unless documented as unrelated.

    Full comparison: N73.1 vs O23 →

  • O75.3— Excludes1 conflict (Excludes1 — generally not reported together)

    Not coded here — the tabular list excludes this pair for the same encounter.

    Not reported together with this code, except where the two conditions are documented as unrelated.

    What moves you there: Documentation of pregnancy, childbirth and the puerperium moves the case to O75.3; the two are not reported together unless documented as unrelated.

    Full comparison: N73.1 vs O75.3 →

Relationships are read from this code's own official notes, its laterality siblings and its encounter family; the wording of each distinction is MedCoder editorial, and the documentation named in each “what moves you there” line is the official note phrase or sibling title itself. Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a.

Coding context

Guidelines, coding notes, decision aids, relationships (with MS-DRG and CCSR classification), hierarchy, HCC, coverage and the context map: what a coder reaches for after the core. Each section names whether it is official source data, a MedCoder-derived relationship or MedCoder editorial.

Code Overview

Chronic parametritis and pelvic cellulitis is a billable ICD-10-CM diagnosis code (N73.1).

MedCoder summary Summary composed by MedCoder from this code's official ICD-10-CM record. The tabular instructional notes themselves appear verbatim below.

Decision Points

The directives on this code's own record, as a pre-claim checklist.

  1. 1 Use Additional Code instruction — report the named additional code(s) when the documentation supports them. See the Use Additional Code notes
  2. 1 Code Also note — a second code may apply; the guidelines leave its sequencing to the circumstances of the encounter. See the Code Also notes
  3. 4 Excludes1 entries — codes named there are generally not reported together with this code (Guidelines I.A.12.a). See the Excludes1 notes

Checklist rows are derived from this code's own official directives; the wording of each check is MedCoder editorial. The official notes themselves are in the sections each row links to.

Verify Before Coding

  • No Medicare Code Editor or MS-DRG Definitions Manual restrictions apply to this code.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

MedCoder-derived relationships — computed from published CMS and AHRQ datasets

Other codes that name N73.1 or its code family, from the CMS ICD-10-CM tabular instructional notes. Tabular-note edges are stored at the code family level that carries each note.

Referenced by 1 Code Also instruction: K6A.0 — Pelvic abscess (via N73.-).

These codes suggest coding this condition alongside when both are present.

MS-DRG Grouper Relationships (FY2027)

Potential MS-DRG participation — not a DRG assignment.

FY2027 MS-DRG: not on the CMS CC/MCC list — as a secondary diagnosis this code does not change MS-DRG severity for that release.

Named in the grouper logic of 5 MS-DRGs: DRG 742 (MDC 13), DRG 743 (MDC 13), DRG 757 (MDC 13), DRG 758 (MDC 13), DRG 759 (MDC 13).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Clinical classification (AHRQ CCSR):GEN018 — Inflammatory diseases of female pelvic organs (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Related Codes

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Inflammatory diseases of female pelvic organs).

N70.12 — Chronic oophoritis, N70.13 — Chronic salpingitis and oophoritis, N70.91 — Salpingitis, unspecified, N70.92 — Oophoritis, unspecified, N70.93 — Salpingitis and oophoritis, unspecified, N71.0 — Acute inflammatory disease of uterus, N71.1 — Chronic inflammatory disease of uterus, N71.9 — Inflammatory disease of uterus, unspecified, N72 — Inflammatory disease of cervix uteri, N73.0 — Acute parametritis and pelvic cellulitis, N73.2 — Unspecified parametritis and pelvic cellulitis, N73.3 — Female acute pelvic peritonitis, N73.4 — Female chronic pelvic peritonitis, N73.5 — Female pelvic peritonitis, unspecified, N73.6 — Female pelvic peritoneal adhesions (postinfective), N73.8 — Other specified female pelvic inflammatory diseases, N73.9 — Female pelvic inflammatory disease, unspecified, N74 — Female pelvic inflammatory disorders in diseases classified elsewhere, N75.0 — Cyst of Bartholin's gland, N75.1 — Abscess of Bartholin's gland, +43 more

Same Index main term, other category

The ICD-10-CM Index to Diseases and Injuries files this code under the main term “Abscess”; these codes share that main term but sit in a different category of the Tabular List.

N34.0 — Urethral abscess (urinary), N41.2 — Abscess of prostate (prostate), N45.4 — Abscess of epididymis or testis (testis), N48.21 — Abscess of corpus cavernosum and penis (penis), N49.0 — Inflammatory disorders of seminal vesicle (seminal vesicle), N49.1 — Inflammatory disorders of spermatic cord, tunica vaginalis and vas deferens (vas deferens), N49.2 — Inflammatory disorders of scrotum (scrotum), N49.8 — Inflammatory disorders of other specified male genital organs (genital organ or tract, male, specified NEC), N49.9 — Inflammatory disorder of unspecified male genital organ (genital organ or tract, male), N61.1 — Abscess of the breast and nipple (areola), N75.1 — Abscess of Bartholin's gland (Bartholin's gland), N76.4 — Abscess of vulva (vulva), O08.0 — Genital tract and pelvic infection following ectopic and molar pregnancy (Bartholin's gland, with, ectopic or molar pregnancy), O85 — Puerperal sepsis (peritoneum, peritoneal, puerperal, postpartum, childbirth), O86.01 — Infection of obstetric surgical wound, superficial incisional site (stitch, following an obstetrical procedure), O86.02 — Infection of obstetric surgical wound, deep incisional site (intramuscular, following procedure, obstetrical), O86.03 — Infection of obstetric surgical wound, organ and space site (subphrenic, following an obstetrical procedure), O86.21 — Infection of kidney following delivery (kidney, puerperal), O91.11 — Abscess of breast associated with pregnancy (gestational mammary), P38.1 — Omphalitis with mild hemorrhage (navel, newborn, with mild hemorrhage), +157 more

Contextual Map

Every relationship of N73.1 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Run N73.1 with these 2 related codes in Claim Check

Hierarchy

Excludes1

Referenced by Code Also instructions

  • K6A.0 — Pelvic abscess[Code Also](via N73.-): “female pelvic inflammatory disease (N73.-)”— CMS ICD-10-CM tabular instructional notes · icd10cm-fy2027

Clinical classification (CCSR)

MS-DRG Grouper

MDC crossing

  • MDC 13 — Diseases and Disorders of the Female Reproductive System[MDC crossing]: “Diseases and Disorders of the Female Reproductive System — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs. 2,238 same-MDC procedures group here; browse them on the MDC page.”— CMS MS-DRG Definitions Manual · FY2027

Index entries

  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic), broad ligament, chronic[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Abscess (connective tissue) (embolic) (fistulous) (infective) (metastatic) (multiple) (pernicious) (pyogenic) (septic), parametric, parametrium, chronic[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027
  • Disease, diseased, pelvis, pelvic, inflammatory (female), chronic[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2027

Nearest codes (9)

Change history (2)

Reference

Index terms and tables, published questions and FAQ, every source behind this page with its release and checksum, the date-of-service check and the complete change history.

Indexed Clinical Terms (3)

Official source data — entries quoted as published, in the Index’s own lookup phrasing

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code. These are alphabetic-index entries shown as the Index writes them — lookup phrasing, not necessarily the wording of a final diagnosis.

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data
CMS/CDC ICD-10-CM FY2027 tabular list, index and tables, effective October 1, 2026 Release, file and checksum · Publisher’s page
Claim edits Official source data
CMS Definitions of Medicare Code Edits — v44.0 (October 2026) Release, file and checksum · Publisher’s page
Inpatient payment groups Official source data
CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v44 Release, file and checksum · Publisher’s page
Change history and date-of-service validity Official source data
CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page
Comparisons, relationships and the contextual map MedCoder-derived relationship
Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears
Summary and FAQ answers MedCoder editorial explanation
Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Current data releases:ICD-10-CM FY2027 · ICD-10-PCS FY2027 · HCPCS October 2026 · MS-DRG v44 · Medicare Code Editor v44.0 · NCCI PTP Q4 2026 · MUE Q4 2026 · NCD code lists 2026-01 · LCD export September 20, 2026 · All releases and sources

Labels on this page: Official source data · MedCoder-derived relationship · MedCoder editorial explanation. How to read the labels · All data sources and release dates · CMS coding rules

Cite this page

Reference this page in a research guide, syllabus or article. The release is included because code content changes each year.

MedCoder.ai. "N73.1 — Chronic parametritis and pelvic cellulitis." ICD-10-CM FY2027. https://medcoder.ai/icd10/code/n73.1-chronic-parametritis-and-pelvic-cellulitis

Change history

Changed in FY2027, the release in force: Code Also note added.

  • FY2027 — October 1, 2026
    Code Also note added
    , if applicable, pelvic abscess (K6A.0-)
    FY2027 changes
  • FY2016 — October 1, 2015
    In the code set at ICD-10-CM adoption
    Chronic parametritis and pelvic cellulitis

Nearest Codes in This Family

Official ICD-10-CM classifications closest to N73.1 in its code family, with their registry titles.

View all codes in the N73 family