2026 ICD-10-CM Diagnosis Code P90Convulsions of newborn
ICD-10-CM Codes›P00–P96›P90-P96›P90
- Billable — Valid for Submission
- MCC — Major Complication or Comorbidity
- Risk Adjusts — HCC 201
- Not Chronic
P90 is a billable ICD-10-CM diagnosis code for convulsions of newborn. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 791, 793. As a secondary diagnosis, it counts as a major complication or comorbidity (MCC) and places an inpatient stay in the highest severity level of its MS-DRG family. It does not count, however, when the principal diagnosis is one of 25 closely related codes. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Neonatal cerebral disorders.
For Medicare Advantage risk adjustment, P90 maps to CMS-HCC Category 201 (Seizure Disorders and Convulsions) under the V28 model, adding a risk factor of about 0.245 for a community, non-dual, aged beneficiary in payment year 2026.
Code Identity
Code Classification
Medicare Risk Adjustment (HCC)Billing
P90 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 2026.
Source: CMS Payment Year 2026 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.
- Acute repetitive seizure
- Acute seizure due to infection of central nervous system
- Central convulsion
- Choreoathetosis
- Daily seizures
- DEND syndrome
- Disorder of beta and omega amino acid metabolism
- Disorder of gamma aminobutyric acid metabolism
- Disorder of lysine and hydroxylysine metabolism
- EEG abnormality with seizure
- Emergency epilepsy treatment since last appointment
- Epilepsy monitoring status
- Epileptic cry
- Folinic acid responsive developmental and epileptic encephalopathy
- Genetic syndromic childhood obesity
- Hereditary cerebellar atrophy
- ICCA syndrome
- Intellectual disability, seizures, hypotonia, ophthalmologic, skeletal anomalies syndrome
- Intellectual disability, seizures, macrocephaly, obesity syndrome
- Lethal neonatal spasticity, epileptic encephalopathy syndrome
- Many seizures a day
- Neonatal diabetes mellitus
- Neonatal focal automatism epileptic seizure
- Neonatal focal autonomic epileptic seizure
- Neonatal focal behavioral arrest epileptic seizure
- Neonatal focal clonic epileptic seizure
- Neonatal focal electro-clinical epileptic seizure
- Neonatal focal electrographic-only epileptic seizure
- Neonatal focal epileptic seizure
- Neonatal focal epileptic spasms
- Neonatal focal motor electro-clinical epileptic seizure
- Neonatal focal myoclonic epileptic seizure
- Neonatal focal non-motor electro-clinical epileptic seizure
- Neonatal focal sequential electro-clinical epileptic seizure
- Neonatal focal tonic epileptic seizure
- Neonatal seizure
- Neurodevelopmental delay, seizures, ophthalmic anomalies, osteopenia, cerebellar atrophy syndrome
- Paroxysmal choreoathetosis
- Paroxysmal kinesigenic dyskinesia
- Primary hyperaldosteronism, seizures, neurological abnormalities syndrome
- Pyridoxine-dependent developmental and epileptic encephalopathy
- Recurrent seizure
- Seizure
- Seizure co-occurrent and due to psychoactive substance withdrawal
- Seizure co-occurrent and due to sedative withdrawal
- Seizure co-occurrent and due to substance withdrawal
- Seizure disorder
- Seizures and intellectual disability due to hydroxylysinuria
- Seizures complicating infection
- Seizures complicating infection in the newborn
- Seizures complicating intracranial hemorrhage
- Seizures complicating intracranial hemorrhage in the newborn
- Self-limited neonatal epilepsy
- Situation-related seizures
- Tetanic convulsion
- Traumatic injury due to seizure
Tabular List NotesGuidance
Coding notes and annotation back-references applicable to this code.
Type 1 Excludes
A type 1 excludes note is a pure excludes note. It means "NOT CODED HERE!" An Excludes1 note indicates that the code excluded should never be used at the same time as the code above the Excludes1 note. An Excludes1 is used when two conditions cannot occur together, such as a congenital form versus an acquired form of the same condition.
Index to Diseases and InjuriesGuidance
Alphabetical index entries that point to this code.
Convulsions (idiopathic) See Also: Seizure(s); R56.9
Seizure (s) See Also: Convulsions; R56.9
newborn P90
Clinical ClassificationClinical
AHRQ’s CCSR groups this code into broader clinical categories.
Clinical InformationClinical
Benign Familial Convulsion|Benign Familal Neonatal Seizures|Benign Familial Convulsions|Benign Familial Neonatal Seizures
a group of genetically-determined conditions characterized by a wide spectrum of seizure types occurring in otherwise healthy newborn infants that start during the first week of life and spontaneously disappear between the first and twelfth months of life.Neonatal Seizure
abnormal hypersynchronous electrical activity in the brain of a newborn which may be associated with stereotyped movements or autonomic changes.
Patient EducationClinical
Seizures
Seizures are symptoms of a brain problem. They happen because of sudden, abnormal electrical activity in the brain. When people think of seizures, they often think of convulsions in which a person's body shakes rapidly and uncontrollably. Not all seizures cause convulsions. There are many types of seizures and some have mild symptoms.
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert P90 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About P90Overview
What is the ICD-10 code for convulsions of newborn?
The ICD-10-CM code for convulsions of newborn is P90. It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
Is P90 (Convulsions of newborn) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report convulsions of newborn on HIPAA-covered claims from October 1, 2025 through September 30, 2026.
What MS-DRG does P90 group to?
When convulsions of newborn is the principal diagnosis on an inpatient stay, it groups to MS-DRG 791, 793, with relative weights from 4.0590 to 4.1696 depending on complications. Higher weights mean higher Medicare reimbursement.
Is P90 a CC or MCC?
CMS lists P90 as an MCC (major complication or comorbidity) for FY 2026. Reported as a secondary diagnosis, it places the inpatient stay in the highest-weighted DRG of its severity family. It does not count when the principal diagnosis is one of the 25 closely related codes in its exclusion list.
What is the ICD-9 equivalent of P90?
Under the General Equivalence Mappings, convulsions of newborn converts to ICD-9-CM 779.0 (convulsions in newborn). The mapping is a direct match.
What HCC is P90?
P90 (convulsions of newborn) maps to CMS-HCC Category 201 (Seizure Disorders and Convulsions), commonly written as HCC 201, in the CMS-HCC V28 model used for Medicare Advantage risk adjustment in payment year 2026. It does not map to any RxHCC in the Part D prescription drug model.
Does P90 risk-adjust for Medicare Advantage payment?
Yes. When documented and reported on a Medicare Advantage encounter, P90 adds a risk adjustment factor of about 0.245 to the beneficiary's RAF score for a community, non-dual, aged enrollee (published V28 weights range from 0.131 to 0.245 depending on the payment segment). HCC 201 sits at the top of its hierarchy, so no other condition category supersedes it. See the full factor table on the HCC 201 category page.
