N91.0 — Primary amenorrhea
N91.0 is a billable, specific ICD-10-CM code for primary amenorrhea. It is valid for submission on a claim.
Risk adjustment
N91.0 does not map to an HCC and does not risk-adjust under CMS-HCC V28. That is normal — most ICD-10 codes do not. It still needs to be coded correctly; it just will not move a RAF score.
Medicare coverage
N91.0 is named in 1 Medicare coverage policy — 1 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A57204Billing and Coding: MRI and CT Scans of the Head and Neck
How N91.0 is indexed
Coders do not find codes by browsing the tabular list — they look them up in the alphabetic index, under the word the physician wrote. These are the index entries that lead here, so you can see which chart wordings map to N91.0.
- Amenorrhea›primary
- Delay, delayed›menstruation(cause unknown)
- Failure, failed›menstruation at puberty
- Menstruation›delayed
Related codes at this level
Codes that share N91. If N91.0 is not quite right, the correct code is usually one of these.
Questions about N91.0
- Is N91.0 a billable ICD-10-CM code?
- Yes. N91.0 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does N91.0 sit in the tabular list?
- Diseases of the genitourinary system (N00-N99), in the block Noninflammatory disorders of female genital tract (N80-N98).