ICD-10 Code N83.2: Other and Unspecified Ovarian Cysts – Complete Coding & Billing Guide

ICD-10 code N83.2 is the parent category for other and unspecified ovarian cysts within the ICD-10-CM classification system. It is a non-billable header code — meaning it cannot be submitted on a claim. Accurate billing requires selecting one of its 6-character subcodes, which capture both the cyst type (unspecified vs. other) and laterality (right, left, or unspecified). Coders working in gynecology, ob-gyn, emergency medicine, and women’s health must understand how the N83.2 subcategory is structured before selecting a final billable code.

What Does ICD-10 Code N83.2 Mean?

N83.2 designates ovarian cysts that are acquired, non-neoplastic, non-inflammatory, and not classifiable as follicular (N83.0) or corpus luteum (N83.1) cysts. The “other and unspecified” designation covers a wide range of simple, hemorrhagic, serous, or morphologically indeterminate adnexal cysts identified on imaging or during surgery — when pathology or clinical documentation does not support a more specific cyst type.

Key attributes of the N83.2 category:

• Not billable as coded — a subcategory requiring 5–6 digit specificity before claim submission
• Female diagnosis only — applicable exclusively to female patients
• Present on Admission (POA) exempt — not subject to POA reporting requirements for inpatient claims
• Chapter 14 classification — Diseases of the Genitourinary System (N00–N99), section N80–N98 (Noninflammatory Disorders of Female Genital Tract)
• Effective since FY 2016 — valid in all HIPAA-covered transactions since October 1, 2015; 2026 edition effective October 1, 2025

What Conditions and Diagnoses Does the N83.2 Category Cover?

The N83.2 subcategory captures ovarian cysts that are acquired and benign in nature but not further characterized by type in the clinical documentation. This includes cysts discovered incidentally on imaging, those monitored conservatively without surgical intervention, and those identified intraoperatively but not sent for pathology.

Clinical presentations and scenarios that fall under N83.2x subcodes include:

• Simple adnexal cysts without clear follicular or luteal origin
• Serous or hemorrhagic ovarian cysts where cyst type is not specified by the provider
• Ovarian cysts identified on transvaginal ultrasound (TVUS) or CT without further characterization
• Cysts managed conservatively (watchful waiting, oral contraceptives) without tissue sampling
• Intraoperatively identified cysts where no pathology specimen is obtained
• Functional-type cysts that have persisted beyond a typical resolution window but remain unclassified

What Does This Category Specifically Exclude?

The following conditions carry a Type 1 Excludes note under N83.2 — meaning they must never be coded alongside any N83.2x subcode:

• Developmental ovarian cyst (Q50.1) — congenital origin, not acquired
• Neoplastic ovarian cyst (D27.-) — benign neoplasm; requires histopathologic confirmation
• Polycystic ovarian syndrome (E28.2) — endocrine disorder, coded to metabolic/hormonal chapter
• Stein-Leventhal syndrome (E28.2) — same as PCOS; always mapped to E28.2

An Excludes2 note at the N83 parent level also flags hydrosalpinx (N70.1-) — which may coexist with an ovarian cyst but is coded separately.

When Is an N83.2x Code the Right Code to Use?

Selecting an N83.2x subcode is appropriate only after a structured review of the clinical documentation. Follow this decision workflow in sequence:

1. Confirm the cyst is ovarian in origin — documentation must specify ovarian location, not simply “adnexal” or “pelvic” mass (use R19.0x for uncharacterized pelvic mass).
2. Rule out a more specific cyst type — if documentation states follicular or corpus luteum origin, use N83.0x or N83.1x respectively.
3. Rule out neoplastic origin — if pathology returns a benign neoplasm result (e.g., dermoid, serous cystadenoma), the correct code is from the D27.- range, not N83.2x.
4. Rule out PCOS — if the patient has a known diagnosis of polycystic ovarian syndrome, code E28.2 instead; multiple small cysts associated with PCOS are not coded with N83.2x.
5. Confirm laterality from the imaging report or operative note — if known, select a side-specific subcode (N83.201, N83.202, N83.291, N83.292).
6. Choose between “unspecified” and “other” — see comparison below.

How Does “Unspecified” (N83.20x) Differ From “Other” (N83.29x)?

This distinction trips up even experienced coders. The following table clarifies the correct subcategory selection:

In practice, coders frequently encounter documentation that says simply “ovarian cyst” without elaboration — defaulting to N83.20x is appropriate in those cases, but querying the provider for laterality before claim submission is best practice.

What Documentation Is Required to Support N83.2x Codes?

What Must the Provider Document in the Clinical Notes?

For any N83.2x subcode to be supportable on audit, the provider’s documentation should include all of the following:

1. Explicit ovarian location — “right ovary,” “left ovary,” or at minimum “ovary” (not merely “adnexa” or “pelvis”)
2. Confirmation that the cyst is non-neoplastic — either by imaging characteristics (simple, thin-walled, anechoic) or explicit statement ruling out malignancy
3. Laterality — required to select a side-specific 6-character subcode; absence of laterality forces use of “unspecified side” codes
4. Cyst size and morphology — not required for the ICD-10 code itself, but essential for medical necessity defense in payer audits
5. Clinical context — symptomatic (pelvic pain, menstrual irregularity) or incidentally found; affects medical necessity justification for imaging and procedural claims
6. Management plan — watchful waiting, hormonal suppression, or surgical intervention; supports the encounter’s medical necessity

Which Diagnostic or Lab Results Support This Code?

Supporting diagnostic findings that substantiate an N83.2x code assignment include:

• Transvaginal ultrasound (TVUS) — primary imaging modality; report should note size, echogenicity, wall thickness, septations, and laterality
• Transabdominal pelvic ultrasound — acceptable when TVUS is contraindicated or unavailable
• CT pelvis/abdomen with contrast — used in ED settings or when ultrasound is equivocal
• MRI pelvis — employed for complex or indeterminate cysts to characterize morphology before surgical decision
• CA-125 serum marker — not required for coding, but its documentation signals provider concern about malignancy; its absence may support a benign characterization
• Operative/laparoscopy report — definitive when the cyst is directly visualized and cyst fluid aspirated or cyst excised

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

How Do N83.2x Codes Affect Medical Billing and Claims?

Ovarian cyst claims under N83.2x subcodes are generally covered by commercial payers and Medicare/Medicaid when medical necessity is clearly established in the documentation. Key billing considerations include:

• N83.2x is a female-only diagnosis — claims submitted with a male patient sex code will auto-deny at the clearinghouse; verify demographic data before submission
• Medical necessity for imaging is the most common denial trigger; the clinical note must document symptoms or an evidence-based rationale for ordering TVUS or CT
• Ultrasound surveillance claims (CPT 76830) require an interval note documenting change in cyst size or character to support repeat imaging
• Surgical claims require documentation that conservative management was attempted or clinically contraindicated before laparoscopic intervention
• “Unspecified side” subcodes (N83.209, N83.299) draw additional scrutiny from recovery audit contractors (RACs); laterality should be queried before claim submission whenever possible

What CPT or Procedure Codes Are Commonly Billed With N83.2x?

Note on CPT 58700: Per AAPC coding guidance, the “separate procedure” designation on 58700 may result in carrier-level bundling denials when billed alongside 58661 or 58662. Verify payer-specific NCCI edits and LCD policies before billing together.

Are There Any Prior Authorization or Coverage Restrictions?

• Diagnostic ultrasound (CPT 76830, 76856): Most payers cover without prior authorization for symptomatic patients; asymptomatic incidental cysts may require clinical documentation of size criteria (typically ≥3 cm) to establish medical necessity
• Surgical intervention: Most commercial and government payers require prior authorization for laparoscopic cystectomy (CPT 58661/58662) when not performed emergently
• Medicare LCD (Local Coverage Determinations): No unified national LCD covers ovarian cysts specifically; MAC-level policies vary — coders should verify through the CMS Medicare Coverage Database for their jurisdiction
• Medicaid: Coverage and PA requirements vary by state; many state programs follow commercial medical necessity criteria

What Coding Errors Should You Avoid With N83.2x?

The following errors are the most frequent causes of claim denials, auditor flags, and compliance risk in ovarian cyst coding:

1. Submitting N83.2 (the parent code) as a billable code — N83.2 has no valid claim use; the 5–6 character subcodes are required for all HIPAA transactions.
2. Coding N83.2x when the provider documents “dermoid cyst” or another named neoplastic type — dermoid cysts are classified under D27.- (benign neoplasm of ovary); using N83.29x instead downcodes the diagnosis and misrepresents the pathology.
3. Defaulting to N83.209 (unspecified side) when laterality is documented in the imaging report — coders must review the radiology report, not just the provider’s assessment note, which sometimes omits laterality.
4. Using N83.2x with E28.2 (PCOS) on the same claim — the Type 1 Excludes note prohibits this combination; PCOS-associated cysts code to E28.2 only.
5. Coding N83.2x from a “rule-out” diagnosis in an outpatient setting — ICD-10-CM Official Coding Guidelines Section IV.H prohibit use of unconfirmed diagnoses in outpatient/physician office settings.
6. Failing to add a secondary symptom code — when the patient presents with pelvic pain (N94.89) or menstrual irregularity (N92.x) that drove the encounter, these secondary codes support medical necessity and are frequently omitted.

What Do Auditors Look for When Reviewing Claims With N83.2x?

Auditors — including RAC contractors and internal compliance reviewers — commonly flag the following patterns:

• Use of “unspecified side” subcodes when laterality appears elsewhere in the chart (e.g., imaging report, operative note)
• Repeat ultrasound claims (CPT 76830) without interval documentation of cyst change or symptoms
• Surgical claims where documentation shows the cyst was first identified at surgery with no prior conservative management noted
• N83.29x claims where the operative or pathology report identifies a specific cyst type that maps to D27.- or another code family
• Discordance between the diagnosis code (N83.2x) and the procedure code — e.g., N83.209 billed with a laterality-specific surgical CPT

How Does N83.2 Relate to Other ICD-10 Codes?

Understanding N83.2’s position within the broader coding landscape prevents both undercoding and miscoding of ovarian pathology.

What Is the Correct Code Sequencing When N83.2x Appears With Other Diagnoses?

1. Principal/first-listed diagnosis: Sequence the N83.2x subcode as the principal diagnosis when the ovarian cyst is the condition established after study to be chiefly responsible for the visit.
2. Secondary symptom codes: Add pelvic pain (N94.89), dysmenorrhea (N94.6), or menorrhagia (N92.0) as secondary codes when symptoms are independently documented and managed.
3. No “code first” or “use additional code” instruction applies to N83.2x — it does not require a mandatory sequencing instruction from the tabular.
4. Concurrent diagnoses: When a patient has both an ovarian cyst and endometriosis (N80.x), sequence based on the condition primarily responsible for the encounter; both may be reported when managed during the same visit.

Real-World Coding Scenario — How N83.2x Is Applied in Practice

Patient Encounter: A 34-year-old female presents to her gynecologist with three weeks of right lower quadrant pain and mild bloating. Transvaginal ultrasound performed in-office shows a 3.8 cm simple anechoic cyst on the right ovary with thin walls, no internal echoes, and no septations. No prior cyst is documented. The provider’s assessment reads: “Right ovarian cyst — will monitor conservatively, recheck ultrasound in 6–8 weeks.” No pathology specimen is obtained.

Correct Code Application

• N83.291 — Other ovarian cyst, right side (cyst is confirmed ovarian, right lateral, non-follicular/corpus luteum, non-neoplastic; type is “other” because TVUS morphology is described as simple/serous but not classified as follicular or luteal)
• N94.89 — Other specified conditions associated with female genital organs (right lower quadrant pain documented and managed)
• CPT 76830 — Transvaginal ultrasound, billed for the in-office TVUS

Common Mistake in This Scenario

• Incorrect code selected: N83.209 (Unspecified ovarian cyst, unspecified side)
• Why it fails: Laterality is clearly documented (right ovary) in the ultrasound report. Using the “unspecified side” subcode when laterality is known violates the ICD-10-CM guideline requiring codes to be reported at their highest level of specificity, and it creates an audit flag for downcoding. Additionally, omitting N94.89 leaves documented symptoms unsupported on the claim, weakening medical necessity for the surveillance ultrasound scheduled at follow-up.

Frequently Asked Questions About ICD-10 Code N83.2

Is N83.2 a Billable ICD-10 Code?

N83.2 is not a valid billable code for HIPAA-covered claim transactions. It is a non-billable header category; coders must select one of its 6-character subcodes — such as N83.201, N83.202, N83.209 (unspecified type), or N83.291, N83.292, N83.299 (other type) — to submit a compliant claim. Submitting N83.2 without further specificity will result in claim rejection at the clearinghouse or payer level.

What Is the Difference Between N83.20x and N83.29x?

N83.20x (unspecified ovarian cysts) is used when the provider’s documentation does not specify the cyst type at all — essentially “ovarian cyst, NOS.” N83.29x (other ovarian cysts) is used when the cyst is named or described in documentation (e.g., “simple serous cyst,” “persistent hemorrhagic cyst”) but does not fit the more specific categories of follicular (N83.0x), corpus luteum (N83.1x), or neoplastic (D27.-) cysts. Selecting between these two subcategories is one of the most common laterality and specificity errors flagged during gynecology coding audits.

When Should I Use D27.- Instead of N83.29x for an Ovarian Cyst?

D27.- should be used whenever pathology confirms a neoplastic ovarian cyst, such as a dermoid cyst (mature teratoma), serous cystadenoma, or mucinous cystadenoma. If a provider documents “dermoid cyst” in the assessment — even without a pathology report — code to D27.- rather than N83.29x, because a dermoid is a benign neoplasm by definition. Using N83.29x in this scenario is a miscoding error that understates the clinical finding and can trigger compliance concerns on audit.

Can N83.2x and E28.2 (Polycystic Ovarian Syndrome) Be Coded Together?

No. A Type 1 Excludes note under N83.2 explicitly prohibits coding E28.2 (polycystic ovarian syndrome/Stein-Leventhal syndrome) simultaneously with any N83.2x subcode. The ovarian cysts associated with PCOS are an inherent feature of that endocrine disorder and are fully captured within E28.2 alone. If a patient has a separately documented simple ovarian cyst that is clinically distinct from her PCOS-related cysts, a provider query is warranted before adding N83.2x to the claim.

Are N83.2x Codes Valid for ICD-10-CM Fiscal Year 2026?

The N83.2x subcategory codes remain valid and unchanged in the ICD-10-CM 2026 edition, effective October 1, 2025. No revisions to code descriptions, validity status, or inclusion/exclusion notes were applied to this subcategory in the FY2026 update cycle. Coders should verify annually against the official CMS ICD-10-CM Tabular List release at cms.gov to confirm no mid-year updates have been issued.

What Documentation Should I Query the Provider for Before Submitting an N83.2x Claim?

If the chart supports only N83.209 or N83.299 (unspecified side), query the provider to confirm whether laterality was documented in imaging reports reviewed during the encounter. Also query if the cyst type could support a more specific category — for example, whether a “hemorrhagic cyst” was confirmed as corpus luteum origin (N83.1x) or remains truly unclassified (N83.29x). Provider queries should be conducted according to your facility’s medical billing documentation requirements and AHIMA/ACDIS query guidelines, and must be non-leading in format.

Key Takeaways

Accurate coding within the N83.2 category demands more than a basic lookup — it requires understanding the full subcategory structure, the “other vs. unspecified” distinction, and the Type 1 Excludes relationships that govern when these codes can and cannot be used.

Core points every coder must remember:

• N83.2 is never billable — always code to the full 6-character subcode (N83.201–N83.299)
• Laterality is mandatory for specificity — always review the imaging report, not just the provider note
• “Other” (N83.29x) ≠ “Unspecified” (N83.20x) — the distinction is type documentation, not severity
• Type 1 Excludes are absolute — N83.2x cannot coexist with Q50.1, D27.-, E28.2, or E28.2 on the same claim
• Dermoid and neoplastic cysts always go to D27.- regardless of how the provider phrases the diagnosis in the assessment
• Secondary symptom codes strengthen claims — always code documented pelvic pain, menstrual irregularity, or other presenting symptoms as additional diagnoses
• Unspecified side codes (N83.209, N83.299) increase audit exposure — exhaust all documentation sources before defaulting to these subcodes

For the authoritative source on code-level guidance, refer to the CMS ICD-10-CM Official Coding Guidelines published annually at cms.gov, and consult the AHA Coding Clinic for official coding advice on complex or ambiguous scenarios involving ovarian pathology.