Q07.00 — Arnold-Chiari syndrome without spina bifida or hydrocephalus
Q07.00 is a billable, specific ICD-10-CM code for arnold-chiari syndrome without spina bifida or hydrocephalus. It is valid for submission on a claim.
Excludes1 inherited from the categories above Q07.00
These are not written on Q07.00, but they bind it: a note on a category applies to every code beneath it. Billing Q07.00 with anything listed here is a denial.
Excludes2 inherited from the categories above Q07.00
Also inherited, and the opposite of Excludes1: these conditions are not part of Q07.00, but a patient can have both, so you may code both.
Other codes that can never be billed with Q07.00
These codes carry an Excludes1 note pointing at Q07.00. The conflict binds both ways, but ICD-10-CM only writes it down on one side — so you would not find this by reading Q07.00 alone.
- G91Hydrocephalus
Risk adjustment
Q07.00 risk-adjusts. Under the CMS-HCC V28 model it maps to this category:
- HCC 182 Spinal Cord Disorders/Injuries0.478 RAF
Coefficient shown for the Community Non-dual Aged segment. A higher HCC in the same hierarchy will suppress this one, so capturing it does not always add score.
Medicare coverage
Q07.00 is named in 17 Medicare coverage policies — 17 listing it as supporting medical necessity. Which of them applies to you depends on your Medicare contractor, and coverage genuinely differs by state.
- A54095Billing and Coding: Nerve Conduction Studies and Electromyography
- A54111Billing and Coding: Speech Language Pathology (SLP) Services: Communication Disorders
- A54969Billing and Coding: Nerve Conduction Studies and Electromyography
- A56619Billing and Coding: Nerve Conduction Studies and Electromyography
How Q07.00 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 Q07.00.
- Arnold-Chiari disease, obstruction or syndrome(type II)
Code history
Q07.00 has not changed since FY2024 — no addition, revision or deletion across the three most recent ICD-10-CM releases.
Related codes at this level
Codes that share Q07.0. If Q07.00 is not quite right, the correct code is usually one of these.
Questions about Q07.00
- Is Q07.00 a billable ICD-10-CM code?
- Yes. Q07.00 is a billable, specific ICD-10-CM code and is valid for submission on a claim.
- Where does Q07.00 sit in the tabular list?
- Congenital malformations, deformations and chromosomal abnormalities (Q00-QA0), in the block Congenital malformations of the nervous system (Q00-Q07).
- What cannot be coded together with Q07.00?
- Q07.00 carries Excludes1 notes, which means the conditions they list can never be coded together with it on the same encounter. Some are written on the categories above Q07.00 (Q07.0) and apply to it just the same.