What is the ICD-10 code for primary amenorrhea?

The ICD-10 code for primary amenorrhea is N91.0, used when a female has not started menstruating by age 15 with secondary sexual characteristics or by age 13 without them.

How is secondary amenorrhea coded in ICD-10?

Secondary amenorrhea is coded as N91.1 in ICD-10, applicable when menstruation ceases for three or more cycles in a previously menstruating individual.

ICD-10 Coding for Amenorrhea(N91.0, E28.2, E28.3)

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Comprehensive guide on ICD-10 coding for amenorrhea, including primary and secondary types, documentation requirements, and common coding pitfalls.

Also known as:

Absence of menstruationMenstrual cessation

Related ICD-10 Code Ranges

Complete code families applicable to Amenorrhea

N00-N99Primary Range

Diseases of the genitourinary system

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Code Comparison: When to Use Each Code

Compare key differences between these codes to ensure accurate selection

Code	Description	When to Use	Key Documentation
N91.0	Primary amenorrhea	Use for patients who have not started menstruating by age 15 with secondary sexual characteristics or by age 13 without them.	Patient age and absence of menarche Presence or absence of secondary sexual characteristics Pelvic ultrasound confirming uterine anatomy
N91.1	Secondary amenorrhea	Use for patients with a history of regular menstruation who have missed three or more consecutive cycles.	History of regular menstruation followed by absence for ≥3 cycles Negative pregnancy test normal prolactin and TSH levels
N91.2	Amenorrhea, unspecified	Use when documentation does not specify whether amenorrhea is primary or secondary.	Lack of specific documentation to classify as primary or secondary

Primary ICD-10-CM Codes

Primary amenorrhea

N91.0Billable

Differential Codes

Alternative codes to consider when ruling out similar conditions

Primary ovarian failureE28.3

Polycystic ovarian syndromeE28.2

Primary amenorrheaN91.0

Secondary amenorrheaN91.1

Documentation & Coding Risks

Avoid these common issues when documenting Amenorrhea.

Not documenting secondary sexual characteristics for primary amenorrhea

Impact

Clinical: Misdiagnosis of amenorrhea type., Regulatory: Potential for audit and compliance issues., Financial: Incorrect coding may lead to reimbursement denials.

Mitigation

Ensure thorough physical examination documentation., Include Tanner staging in records.

Using N91.2 when type is inferrable

Impact

Reimbursement: May affect DRG assignments and reimbursement rates., Compliance: Increases risk of audits and denials., Data Quality: Leads to inaccurate data collection and reporting.

Mitigation

Query provider for more details to specify primary or secondary amenorrhea.

Use of unspecified codes

Impact

High audit risk when using N91.2 without sufficient documentation.

Mitigation

Ensure detailed documentation to support specific coding.

Frequently Asked Questions

Documentation requirements, coding pitfalls and FAQs for conditions coded with N91.0.

Primary Code

N91.0

Primary amenorrhea

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ICD-10 codes5

Coding risks3

FAQs2

ICD-10 Coding for Amenorrhea(N91.0, E28.2, E28.3)

Documentation & Coding Risks

Frequently Asked Questions

What is the ICD-10 code for primary amenorrhea?

How is secondary amenorrhea coded in ICD-10?

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