Is F84.2 a billable ICD-10-CM code?

Yes. F84.2 is a billable, specific ICD-10-CM code and is valid for submission on a claim.

Where does F84.2 sit in the tabular list?

Mental, Behavioral and Neurodevelopmental disorders (F01-F99), in the block Pervasive and specific developmental disorders (F80-F89).

What cannot be coded together with F84.2?

F84.2 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.

F84.2

F84.2 — Rett's syndrome

Billable / specific codeICD-10-CM

F84.2 is a billable, specific ICD-10-CM code for rett's syndrome. It is valid for submission on a claim.

Excludes1 — never code together

These conditions cannot occur together. Billing both on the same encounter is a denial.

Asperger's syndrome (F84.5)
Autistic disorder (F84.0)
Other childhood disintegrative disorder (F84.3)

Other codes that can never be billed with F84.2

These codes carry an Excludes1 note pointing at F84.2. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading F84.2 alone.

F84.3Other childhood disintegrative disorder

Risk adjustment

F84.2 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

F84.2 is named in 2 Medicare coverage policies — 2 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.

A56612Billing and Coding: CT of the Head
A57204Billing and Coding: MRI and CT Scans of the Head and Neck

How F84.2 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 F84.2.

Rett's disease or syndrome

Related codes at this level

Codes that share F84. If F84.2 is not quite right, the correct code is usually one of these.

Questions about F84.2

Is F84.2 a billable ICD-10-CM code?: Yes. F84.2 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
Where does F84.2 sit in the tabular list?: Mental, Behavioral and Neurodevelopmental disorders (F01-F99), in the block Pervasive and specific developmental disorders (F80-F89).
What cannot be coded together with F84.2?: F84.2 carries an Excludes1 note, which means the conditions it lists can never be coded together with it on the same encounter.