2027 ICD-10-CM Diagnosis Code Q07.8Other specified congenital malformations of nervous system
ICD-10-CM Codes›Q00-Q99›Q00-Q07›Q07
- Billable — Valid for Submission
- Risk Adjusts — HCC 182
- POA Exempt
- Chronic Condition
Q07.8 is a billable ICD-10-CM diagnosis code for other specified congenital malformations of nervous system. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) and groups to MS-DRG 91 through 93, 791, 793. The code is exempt from POA reporting. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Nervous system congenital anomalies.
For Medicare Advantage risk adjustment, Q07.8 maps to CMS-HCC Category 182 (Spinal Cord Disorders/Injuries) under the V28 model, adding a risk factor of about 0.478 for a community, non-dual, aged beneficiary in payment year 2027.
Code Identity
Code Classification
Present on Admission (POA)Billing
Q07.8 is exempt from POA reporting on inpatient claims to general acute care hospitals. Review the other POA exempt codes in Congenital malformations of the nervous system (Q00-Q07).
Medicare Risk Adjustment (HCC)Billing
Q07.8 maps to a payment category in the CMS-HCC model used to risk-adjust Medicare Advantage payments. Weights are the published community factors for payment year 2027.
Source: CMS Payment Year 2027 risk adjustment mappings and model software. Weights are relative factors, not dollar amounts; a beneficiary's total RAF also includes demographics and interactions. Browse all CMS-HCC categories.
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Abnormality of neurogenesis
- Adhesion of brain meninges
- Adhesion of meninges
- Aganglionosis of parasympathetic nerve ganglia
- Agenesis of nerve
- Aplasia of optic nerve
- Brachial plexus displacement
- Cataract, congenital heart disease, neural tube defect syndrome
- Cerebro-oculo-facio-skeletal syndrome
- Cerebrooculonasal syndrome
- Cochlear nerve disorder
- Congenital absence of myelination of peripheral nerve
- Congenital achiasma
- Congenital adhesions of brain meninges
- Congenital anomaly of cochlea
- Congenital anomaly of macula
- Congenital anomaly of membranous labyrinth
- Congenital anomaly of optic nerve
- Congenital anomaly of visual system
- Congenital deficiency of cochlear nerve
- Congenital degeneration of nervous system
- Congenital disorder of facial nerve
- Congenital hypomyelinating neuropathy
- Congenital hypoplasia of cerebral hemisphere
- Congenital hypoplasia of corticospinal tract
- Congenital hypoplasia of fovea centralis
- Congenital hypoplasia of macula lutea
- Congenital hypoplasia of olfactory tract
- Congenital hypoplasia of optic tract
- Congenital hypoplasia of retina
- Congenital hypoplasia of vestibular nerve
- Congenital indifference to pain
- Congenital ischemic atrophy of central nervous system structure
- Congenital spastic foot
- Deafness, encephaloneuropathy, obesity, valvulopathy syndrome
- Developmental displacement of brachial plexus
- Disorder of neuronal migration and differentiation
- Disorder of optic tract
- Ectopic glial tissue
- FBXL4-related encephalomyopathic mitochondrial DNA depletion syndrome
- Finding of pain tolerance
- Foveal hypoplasia, optic nerve decussation defect, anterior segment dysgenesis syndrome
- Hydranencephaly
- Immature ganglionosis of large intestine
- Indifference to pain
- Isolated aplasia of optic nerve
- MARCH syndrome
- Marinesco-Sjögren syndrome
- Mega cisterna magna
- Mitochondrial DNA depletion syndrome encephalomyopathic form
- Mitochondrial DNA depletion syndrome, encephalomyopathic form with variable craniofacial anomalies
- Multiple congenital anomalies, neurodevelopmental delay, ocular abnormalities syndrome
- Neuroectodermal melanolysosomal disease
- Neuronal choristoma
- Neuronal heterotopia
- Polycystic lipomembranous osteodysplasia with sclerosing leukoencephalopathy
- Port-wine nevi, mega cisterna magna, hydrocephalus syndrome
- Port-wine stain of skin
- RRM2B-related mitochondrial DNA depletion syndrome, encephalomyopathic form with renal tubulopathy
- Schisis association syndrome
- Spastic foot
- Structural abnormality of Auerbach plexus
- Structural abnormality of fovea centralis
- Structural abnormality of Meissner plexus
- X-linked periventricular heterotopia
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to Q07.8: its own notes plus those printed at Q07 and Chapter 17. A note printed at a category, block or chapter applies to every code under it.
Applicable To
Conditions this code is used for: synonyms of the title or, for "other specified" codes, the conditions assigned to it. The list is not exhaustive.
- Agenesis of nerve
- Displacement of brachial plexus
- Jaw-winking syndrome
- Marcus Gunn's syndrome
Excludes2
Not included here: the excluded condition is not part of this code, but a patient may have both, so both codes may be reported.
Notes
General instructions on how these codes are used.
- Codes from this chapter are not for use on maternal records
Source: CMS ICD-10-CM Tabular List. How to read instructional notes.
Referenced in Other NotesGuidance
Instructional notes printed at other codes that name Q07.8, its category, or a range that includes it.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
nerve Q07.8
nervous system, part NEC Q07.8
nuclear Q07.8
Anomaly, anomalous (congenital) (unspecified type) Q89.9
acoustic nerve Q07.8
plexus Q07.8
meningeal bands or folds Q07.9
constriction of Q07.8
nerve Q07.8
sense organs NEC Q07.8
nerve root Q07.8
Gunn's syndrome Q07.8
Malformation (congenital) See Also: Anomaly;
plexus Q07.8
nerve root Q07.8
brachial plexus Q07.8
nerve Q07.8
nervous system NEC Q07.8
Marcus Gunn's syndrome Q07.8
jaw-winking Q07.8
Syndrome See Also: Disease;
jaw-winking Q07.8
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Patient EducationClinical
Brain Malformations
Most brain malformations begin long before a baby is born. Something damages the developing nervous system or causes it to develop abnormally. Sometimes it's a genetic problem. In other cases, exposure to certain medicines, infections, or radiation during pregnancy interferes with brain development.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert Q07.8 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About Q07.8Overview
What is the ICD-10 code for other specified congenital malformations of nervous system?
The ICD-10-CM code for other specified congenital malformations of nervous system is Q07.8 (sometimes written as Q078). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is Q07.8 (Other congenital malformations of nervous system) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report other specified congenital malformations of nervous system on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does Q07.8 group to?
When other specified congenital malformations of nervous system is the principal diagnosis on an inpatient stay, it groups to MS-DRG 793, 791, 91, 92, 93, with relative weights from 0.7783 to 4.2192 depending on complications. Higher weights mean higher Medicare reimbursement.
Is Q07.8 exempt from POA reporting?
Yes. CMS lists this code among those exempt from present on admission reporting, so hospitals do not assign a POA indicator for other specified congenital malformations of nervous system on inpatient claims. The code appears in the Congenital malformations of the nervous system (Q00-Q07) range of the CMS exempt list.
What is the ICD-9 equivalent of Q07.8?
Under the General Equivalence Mappings, other specified congenital malformations of nervous system converts to ICD-9-CM 742.8 (nervous system anom NEC). The mapping is approximate, so confirm the match fits the documentation.
What HCC is Q07.8?
Q07.8 (other specified congenital malformations of nervous system) maps to CMS-HCC Category 182 (Spinal Cord Disorders/Injuries), commonly written as HCC 182, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2027. It mapped to HCC 72 under the retired V24 model. It also maps in the PACE (CMS-HCC V22), ESRD (V21), and ESRD (V24) models. In the Part D prescription drug model it maps to RxHCC 155.
Does Q07.8 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, Q07.8 adds a risk adjustment factor of about 0.478 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.270 to 0.478 depending on the payment segment). A more severe related category (HCC 180, HCC 181, HCC 191, and HCC 192) supersedes it when both are reported. See the full factor table on the HCC 182 category page.
