ICD-10 Code N84.1: Polyp of Cervix Uteri – Complete Coding & Billing Guide

What Does ICD-10 Code N84.1 Mean?

ICD-10-CM code N84.1 designates a diagnosis of polyp of cervix uteri — a benign, protruding growth arising from the mucosal surface of the cervix. The code is billable, valid for fiscal year 2026 (effective October 1, 2025), and applies exclusively to female patients. It falls under Chapter 14 (Diseases of the Genitourinary System) within the N84 category, which covers polyps of the female genital tract.

Key attributes of this code:

• Valid and billable for all HIPAA-covered transactions through September 30, 2026
• Applicable to female patients only — gender-specific coding restriction enforced by most payers
• Does not require a decimal point when submitted electronically (submit as N841 to avoid claim rejection at certain clearinghouses)
• Applicable in both outpatient and inpatient settings, though clinical context drives the encounter type
• Maps from ICD-9-CM code 622.7 (Mucous polyp of cervix) for legacy crosswalk reference

What Conditions and Diagnoses Does N84.1 Cover?

N84.1 encompasses confirmed polyp formations originating on or from the cervix uteri — including both ectocervical and endocervical locations — when the polyp itself, and not a malignancy or other neoplasm, is the documented clinical finding.

Clinical presentations and scenarios covered:

• A pedunculated or sessile polyp visualized on speculum examination at the cervical os
• An endocervical polyp documented on colposcopy or during a procedure
• A mucous polyp of the cervix confirmed clinically without histological malignancy
• An adenomatous polyp of the cervix uteri — explicitly listed as a valid synonym under N84.1 in the Tabular
• A polyp discovered incidentally during a pelvic exam, IUD placement, or routine Pap smear visit
• Abnormal uterine bleeding attributable to an endocervical polyp, when the provider documents the polyp as the underlying cause

What Does N84.1 Specifically Exclude?

The N84 category carries an Excludes1 note, which means the following codes should never be used simultaneously with N84.1:

• D28.– (Benign neoplasm of other and unspecified female genital organs) — use when histology confirms a true benign neoplasm distinct from an inflammatory or hyperplastic polyp
• Any code indicating adenocarcinoma, cervical dysplasia, or CIN — these are separate, distinct pathological findings requiring codes from the N87 or cervical cancer categories

When Is N84.1 the Right Code to Use?

Selecting N84.1 correctly requires confirming that the polyp is located on the cervix specifically and that the documentation supports a benign, non-neoplastic growth. Use the following step-by-step criteria:

1. Confirm anatomical location. The provider must document the polyp on the cervix uteri — not the endometrium, vagina, vulva, or fallopian tube.
2. Verify that the finding is not classified as a malignancy or CIN. If pathology returns dysplasia or carcinoma, move to the appropriate neoplasm or dysplasia code.
3. Confirm the polyp is the reason for the encounter (or a significant contributing finding if secondary).
4. Ensure no more specific code applies. If the provider specifies an adenomatous polyp of the cervix, N84.1 remains correct — this is listed as an included synonym.
5. Apply the code to female patients only. Payer systems will reject N84.1 on a claim for a male patient.

How Does N84.1 Differ From N84.0 and N84.9?

In practice, coders frequently encounter confusion between N84.0, N84.1, and N84.9 — particularly when pathology reports describe a “uterine polyp” without specifying exact location. The distinction is anatomically driven:

Auditors commonly flag the use of N84.9 when operative or procedure notes clearly describe a cervical polyp — this is a specificity failure that exposes claims to audit and payer query.

What Documentation Is Required to Support N84.1?

Inadequate documentation is the most common driver of N84.1 claim denials and post-payment audit findings. Medical necessity and code specificity both hinge on the clinical note.

What Must the Provider Document in the Clinical Notes?

1. Explicit anatomical location — “cervical polyp,” “endocervical polyp,” or “polyp at the cervical os” (not simply “uterine polyp” or “pelvic mass”)
2. Visual or procedural confirmation — speculum exam findings, colposcopic visualization, or documentation of the polyp encountered during a procedure
3. Description of polyp morphology — pedunculated vs. sessile, size in centimeters, color, friability, and any active bleeding at the site
4. Symptom linkage — if the polyp is the attributed cause of postcoital bleeding, intermenstrual bleeding, or abnormal discharge, the provider must document that connection
5. Treatment rendered or recommended — removal, biopsy, watchful waiting, or referral
6. Specimen disposition — if the polyp was excised, document whether it was sent to pathology and the gross description

Which Diagnostic or Lab Results Support N84.1?

• Speculum examination findings — direct visualization is sufficient for coding; biopsy is not required to apply N84.1
• Colposcopy report — specifies location, appearance, and vascularity patterns of the polyp
• Histopathology/pathology report — confirms benign endocervical or ectocervical tissue; rules out adenocarcinoma or dysplasia
• Pelvic ultrasound — may identify a cervical mass but typically insufficient alone to confirm polyp morphology for coding purposes
• Pap smear or liquid-based cytology — can reveal abnormal glandular cells prompting further evaluation but does not code the polyp itself

What Is the Documentation Standard for Inpatient vs. Outpatient Settings?

How Does N84.1 Affect Medical Billing and Claims?

N84.1 is a well-recognized diagnosis in gynecology billing, but claims still require careful construction — particularly when the polyp is discovered during a separate encounter or removed alongside other procedures.

Key billing considerations:

• N84.1 supports medical necessity for cervical polypectomy procedures — payers expect a clear diagnostic link between the code and the procedure performed
• When a cervical polyp is discovered incidentally during a preventive exam, coders must apply modifier 25 to the E&M code to establish that the decision to treat was significant and separately identifiable from the wellness visit
• Electronic claims: submit the code as N841 (no decimal point) to avoid rejection at clearinghouses that do not auto-strip punctuation
• N84.1 does not automatically indicate malignant potential — payers will not trigger prior authorization for routine polypectomy on this diagnosis alone, but high-volume billing of this code with frequent surgical procedure codes may trigger payer review

What CPT Codes Are Commonly Billed With N84.1?

Are There Any Prior Authorization or Coverage Restrictions?

• Most commercial payers and Medicare do not require prior authorization for in-office cervical polypectomy (CPT 57500) when N84.1 is the supporting diagnosis
• Medicaid plans vary by state — some require notification or authorization when N84.1 is billed with a facility fee
• If the polyp is managed via hysteroscopy in an ambulatory surgical center (ASC) or hospital outpatient department, payer-specific facility coverage policies apply and should be verified in advance
• No active Local Coverage Determination (LCD) from CMS specifically targets N84.1 as a restricted or excluded diagnosis for standard gynecologic procedures

What Coding Errors Should You Avoid With N84.1?

Errors with N84.1 tend to cluster around anatomical confusion, procedure code mismatches, and incomplete documentation — all of which are high-visibility patterns during claims audits.

1. Using N84.0 instead of N84.1 when the operative report documents an endocervical polyp — N84.0 is corpus uteri (endometrium), not endocervix
2. Applying N84.9 (unspecified) when the provider’s notes clearly identify the polyp as cervical — this is a codeable specificity failure
3. Pairing N84.1 with CPT 58558 — this procedure code is for hysteroscopic removal of uterine (endometrial) polyps; using it for a cervical polypectomy is a procedure-diagnosis mismatch that triggers automated denials
4. Failing to append modifier 25 when a cervical polypectomy is performed on the same date as a preventive E&M — without modifier 25, the procedure is bundled into the wellness visit and denied
5. Coding N84.1 based on symptoms alone (e.g., postcoital bleeding, intermenstrual bleeding) before the provider documents a confirmed polyp — symptom codes like N93.9 should be used until the clinical finding is confirmed
6. Omitting pathology results as secondary supporting documentation when the polyp was excised and sent to pathology — auditors expect specimen disposition to be documented

What Do Auditors Look for When Reviewing Claims With N84.1?

• Documentation that anatomical location of the polyp is explicitly stated as cervical — not merely implied
• Alignment between the diagnosis code (N84.1) and the procedure performed (CPT 57500 vs. 58558)
• Correct application of modifier 25 when N84.1 and an E&M are billed on the same date
• Evidence that pathology was ordered when the procedure note documents excision and specimen removal
• Pattern review for claims where N84.1 is billed frequently with complex or high-RVU procedure codes without corresponding complexity in the clinical notes

How Does N84.1 Relate to Other ICD-10 Codes?

Understanding N84.1 within its code family helps coders sequence correctly and avoid under- or over-coding related conditions.

What Is the Correct Code Sequencing When N84.1 Appears With Other Diagnoses?

1. Outpatient (first-listed diagnosis rule): N84.1 is sequenced first when the encounter’s primary purpose is evaluation or treatment of the cervical polyp.
2. Inpatient (principal diagnosis rule): Apply the condition established after study to be chiefly responsible for the admission — N84.1 may be principal or secondary depending on the admission driver.
3. Symptom codes: If postcoital bleeding (N93.9) is documented alongside a confirmed cervical polyp, the polyp (N84.1) should be sequenced first; code the symptom as secondary only if the payer or guideline requires it.
4. When co-existing cervical ectropion is documented: N86 may be added as an additional code — no sequencing priority conflict exists between N84.1 and N86.
5. Never sequence N84.1 as the principal diagnosis for an inpatient admission driven by hemorrhage or another acute condition — the acute condition takes priority under the ICD-10-CM Official Coding Guidelines Section II.

Real-World Coding Scenario — How N84.1 Is Applied in Practice

Patient Encounter: A 44-year-old female presents to her gynecologist’s office with a two-month history of postcoital spotting. During speculum examination, the provider visualizes a 1.2 cm pedunculated polyp at the endocervical os with mild surface friability. The polyp is removed via ring forceps avulsion with hemostasis achieved using silver nitrate. The excised specimen is placed in formalin and sent to pathology. The provider also completes a detailed problem-focused E&M during the same visit.

Correct Code Application

• N84.1 — Polyp of cervix uteri (confirmed by visual exam; pathology pending but not required for coding the encounter)
• CPT 57500 — Local excision of cervical lesion, with fulguration (silver nitrate constitutes the fulguration component)
• CPT 99213-25 — Office E&M, established patient, with modifier 25 to identify a separately identifiable service from the procedure
• Secondary diagnosis: N93.9 — Abnormal uterine and vaginal bleeding (postcoital spotting as documented symptom)

Common Mistake in This Scenario

• Incorrect: Coding N84.0 (polyp of corpus uteri) instead of N84.1 because the report uses the phrase “endocervical polyp” — the endocervix is part of the cervix, not the corpus/endometrium
• Incorrect: Using CPT 58558 (hysteroscopic polypectomy) because the removal was performed via forceps avulsion at the cervical os — no hysteroscope was introduced
• Incorrect: Omitting modifier 25 from the E&M — without it, payers will bundle the office visit into the global procedure period for 57500 and deny the E&M

Frequently Asked Questions About ICD-10 Code N84.1

Is ICD-10 Code N84.1 Valid for Use in 2026?

ICD-10 code N84.1 is valid and billable for fiscal year 2026, with an effective date of October 1, 2025 and no changes to its description or inclusion terms from the prior year. Coders should verify code status annually against the CMS ICD-10-CM tabular updates released each fall.

What Is the Difference Between N84.1 and N84.0?

N84.1 specifies a polyp of the cervix uteri, while N84.0 designates a polyp of the corpus uteri (endometrium). The distinction is anatomical: N84.0 is appropriate when the polyp originates in the body of the uterus and is typically identified via hysteroscopy, whereas N84.1 applies when the polyp arises on or in the cervix and is identifiable on speculum examination or colposcopy.

Can I Use N84.1 for an Endocervical Polyp?

Yes. An endocervical polyp is appropriately coded to N84.1, not N84.0. The endocervix is the inner portion of the cervical canal and is anatomically distinct from the endometrium. Both ectocervical and endocervical polyps fall under N84.1.

What CPT Code Should I Use When a Cervical Polyp Is Removed in the Office?

CPT 57500 is the correct procedural code for in-office removal of a cervical polyp, regardless of whether fulguration is used. CPT 58558 — a common error — is reserved for hysteroscopic removal of uterine polyps and should never be paired with N84.1 for a cervical polypectomy.

Does N84.1 Require Pathology Confirmation Before Coding?

No. N84.1 may be assigned based on a provider’s documented clinical finding — direct visualization of a polyp on the cervix during speculum exam or colposcopy is sufficient. However, if pathology subsequently returns a finding inconsistent with a benign polyp, the diagnosis code must be revised to reflect the confirmed pathological result.

Can N84.1 Be Billed on the Same Day as a Preventive Exam?

Yes, but only with modifier 25 appended to the E&M code. Without modifier 25, payers will bundle the evaluation and management service into the procedure’s global period and deny it. The modifier signals that the decision to evaluate or treat the polyp was a significant, separately identifiable service beyond the scope of the preventive visit.

Is N84.1 a Gender-Restricted Code?

Yes. N84.1 is restricted to female patients, as it describes a condition of the cervix uteri. Claims submitted for a male patient will reject on most payer systems due to sex-edit logic built into clearinghouse and payer adjudication engines.

Key Takeaways

• N84.1 is the correct, billable ICD-10-CM code for any confirmed polyp of the cervix uteri, including endocervical and ectocervical locations
• Never substitute N84.0 when the polyp is described as endocervical — N84.0 is the endometrium, not the endocervix
• CPT 57500 is the primary pairing code for in-office cervical polypectomy; avoid CPT 58558 unless a hysteroscope was used and the polyp was uterine
• Modifier 25 is required whenever a polypectomy and an E&M are billed on the same date of service
• Documentation must explicitly state anatomical location, polyp description, method of hemostasis, and specimen disposition to withstand audit scrutiny
• Pathology confirmation is not required to assign N84.1, but any post-procedure pathology that contradicts a benign finding requires code revision
• Verify the code’s annual validity each October against the ICD-10-CM Official Coding Guidelines published by CMS, available at cms.gov/medicare/coding-billing/icd-10-codes

For related guidance on coding adjacent conditions and procedures, see medical billing documentation requirements for OBGYN encounters, ICD-10-CM Official Coding Guidelines Section I.C.14, and resources on coding audit preparation for gynecologic claims.