ICD-10 · PDGM grouping
Q00-Q07 — Congenital malformations of the nervous system
Every ICD-10-CM code in this range and the PDGM clinical group CMS assigns to it, read from the CMS grouper crosswalk v07.2.26.
Codes in range
45
No clinical group
30
A period cannot be grouped from these.
Barred as primary
0
CMS rejects these in the primary position.
Where these codes group
15 of the 45 codes in Q00-Q07 group to Neuro Rehabilitation. A further 30 are assigned no clinical group at all, which means a 30-day period cannot be grouped from them.
Code families in Q00-Q07
One page per three-character family: every code in it, whether it can lead a claim, its clinical group and comorbidity subgroup.
- Q00Anencephaly and similar malformations3 codes
- Q01Encephalocele5 codes
- Q02Microcephaly1 code
- Q03Congenital hydrocephalus4 codes
- Q04Other congenital malformations of brain9 codes
- Q05Spina bifida10 codes
- Q06Other congenital malformations of spinal cord7 codes
- Q07Other congenital malformations of nervous system6 codes
Every code in Q00-Q07
Descriptions are CMS’s own, abbreviated as CMS abbreviates them.
| Code | Description | Clinical group | Primary position |
|---|---|---|---|
| Q000 | Anencephaly | None | Cannot lead a claim |
| Q001 | Craniorachischisis | None | Cannot lead a claim |
| Q002 | Iniencephaly | None | Cannot lead a claim |
| Q010 | Frontal encephalocele | None | Cannot lead a claim |
| Q011 | Nasofrontal encephalocele | None | Cannot lead a claim |
| Q012 | Occipital encephalocele | None | Cannot lead a claim |
| Q018 | Encephalocele of other sites | None | Cannot lead a claim |
| Q019 | Encephalocele, unspecified | None | Cannot lead a claim |
| Q02 | Microcephaly | None | Cannot lead a claim |
| Q030 | Malformations of aqueduct of Sylvius | None | Cannot lead a claim |
| Q031 | Atresia of foramina of Magendie and Luschka | None | Cannot lead a claim |
| Q038 | Other congenital hydrocephalus | None | Cannot lead a claim |
| Q039 | Congenital hydrocephalus, unspecified | None | Cannot lead a claim |
| Q040 | Congenital malformations of corpus callosum | None | Cannot lead a claim |
| Q041 | Arhinencephaly | None | Cannot lead a claim |
| Q042 | Holoprosencephaly | None | Cannot lead a claim |
| Q043 | Other reduction deformities of brain | None | Cannot lead a claim |
| Q044 | Septo-optic dysplasia of brain | None | Cannot lead a claim |
| Q045 | Megalencephaly | None | Cannot lead a claim |
| Q046 | Congenital cerebral cysts | None | Cannot lead a claim |
| Q048 | Other specified congenital malformations of brain | None | Cannot lead a claim |
| Q049 | Congenital malformation of brain, unspecified | None | Cannot lead a claim |
| Q050 | Cervical spina bifida with hydrocephalus | B | Can lead a claim |
| Q051 | Thoracic spina bifida with hydrocephalus | B | Can lead a claim |
| Q052 | Lumbar spina bifida with hydrocephalus | B | Can lead a claim |
| Q053 | Sacral spina bifida with hydrocephalus | B | Can lead a claim |
| Q054 | Unspecified spina bifida with hydrocephalus | B | Can lead a claim |
| Q055 | Cervical spina bifida without hydrocephalus | B | Can lead a claim |
| Q056 | Thoracic spina bifida without hydrocephalus | B | Can lead a claim |
| Q057 | Lumbar spina bifida without hydrocephalus | B | Can lead a claim |
| Q058 | Sacral spina bifida without hydrocephalus | B | Can lead a claim |
| Q059 | Spina bifida, unspecified | B | Can lead a claim |
| Q060 | Amyelia | None | Cannot lead a claim |
| Q061 | Hypoplasia and dysplasia of spinal cord | None | Cannot lead a claim |
| Q062 | Diastematomyelia | None | Cannot lead a claim |
| Q063 | Other congenital cauda equina malformations | None | Cannot lead a claim |
| Q064 | Hydromyelia | None | Cannot lead a claim |
| Q068 | Other specified congenital malformations of spinal cord | None | Cannot lead a claim |
| Q069 | Congenital malformation of spinal cord, unspecified | None | Cannot lead a claim |
| Q0700 | Arnold-Chiari syndrome without spina bifida or hydrocephalus | B | Can lead a claim |
| Q0701 | Arnold-Chiari syndrome with spina bifida | B | Can lead a claim |
| Q0702 | Arnold-Chiari syndrome with hydrocephalus | B | Can lead a claim |
| Q0703 | Arnold-Chiari syndrome with spina bifida and hydrocephalus | B | Can lead a claim |
| Q078 | Other specified congenital malformations of nervous system | B | Can lead a claim |
| Q079 | Congenital malformation of nervous system, unspecified | None | Cannot lead a claim |
Source: CMS HH PPS Grouper Software v07.2.26, effective 2026-10-01. This is the crosswalk Medicare runs a claim through. Grouping also depends on admission source, timing, the OASIS functional items and the rest of the diagnosis list.
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