2027 ICD-10-CM Diagnosis Code P90Convulsions of newborn

ICD-10-CM Codes›P00–P96›P90-P96›P90

ICD-10-CM P90
CMSSource: CMS FY 2027 ICD-10-CM dataset · Effective Oct 1, 2026 – Sep 30, 2027

P90 is a billable ICD-10-CM diagnosis code for convulsions of newborn. It is valid on HIPAA claims for fiscal year 2027 (October 1, 2026 through September 30, 2027) 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 2027.

Code Identity

ICD-10-CM Code
P90
Billable Status
Yes — Valid for Submission
Code Describes
Convulsions of newborn
Short Description
Convulsions of newborn
Same as the full description in the CMS dataset.
Chapter
P90-P96
Other disorders originating in the perinatal period

Code Classification

ChapterP00–P96Certain conditions originating in the perinatal period
SectionP90-P96Other disorders originating in the perinatal period
CategoryP90Convulsions of newborn
This CodeP90Convulsions of newborn

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 2027.

CMS-HCC V28 Category (Payment Model)
HCC 201— Seizure Disorders and Convulsions
Payment HCC · PY 2027 one of 64 ICD-10-CM codes in this category
Risk Adjustment Factor (RAF) Weight
+0.245
community, non-dual, aged · ranges 0.131–0.245 across segments
Hierarchy
Top of its hierarchy
HCC 201 is not superseded by any other condition category
Prior Model (CMS-HCC V24)
Not mapped under V24
this diagnosis newly risk-adjusts under the V28 model
Part D (RxHCC)
Not mapped
P90 does not risk-adjust in the RxHCC prescription drug model

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.

  • Acute repetitive seizure
  • Acute symptomatic epileptic seizure due to acute infectious disease
  • Central convulsion
  • Central nervous system dysfunction in newborn
  • 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
  • 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 acute symptomatic epileptic seizure due to acute infectious disease
  • Neonatal diabetes mellitus
  • Neonatal focal automatism epileptic seizure
  • Neonatal focal autonomic epileptic seizure
  • Neonatal focal behavior 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
  • Primary hyperaldosteronism, seizures, neurological abnormalities syndrome
  • Pyridoxine-dependent developmental and epileptic encephalopathy
  • Recurrent encephalopathy
  • Recurrent seizure
  • Seizure
  • Seizure disorder
  • Seizures and intellectual disability due to hydroxylysinuria
  • Self-limited focal epilepsy
  • Self-limited neonatal epilepsy
  • Tetanic convulsion
  • Traumatic injury due to seizure

Instructional NotesGuidance

Instructions from the official ICD-10-CM Tabular List that apply to P90: its own notes plus those printed at Chapter 16. A note printed at a category, block or chapter applies to every code under it.

Includes

Further defines, or gives examples of, the content of the category.

From Chapter 16 (P00-P96) Certain conditions originating in the perinatal period applies to 463 codes
  • conditions that have their origin in the fetal or perinatal period (before birth through the first 28 days after birth) even if morbidity occurs later

Excludes1

Not coded here: the excluded code is never reported together with this one, unless the two conditions are unrelated.

  • benign myoclonic epilepsy in infancy (G40.3-)
  • benign neonatal convulsions (familial) (G40.3-)

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.

From Chapter 16 (P00-P96) Certain conditions originating in the perinatal period applies to 463 codes
  • congenital malformations, deformations and chromosomal abnormalities (Q00-Q99)
  • endocrine, nutritional and metabolic diseases (E00-E88)
  • injury, poisoning and certain other consequences of external causes (S00-T88)
  • neoplasms (C00-D49)
  • tetanus neonatorum (A33)

Notes

General instructions on how these codes are used.

From Chapter 16 (P00-P96) Certain conditions originating in the perinatal period applies to 463 codes
  • Codes from this chapter are for use on newborn records only, never 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 P90, its category, or a range that includes it.

Excludes1 2

These codes carry an Excludes1 note naming P90: they are not reported together with it, unless the two conditions are unrelated.

  • G40 Epilepsy and recurrent seizures
    seizure of newborn (P90)
  • R56 Convulsions, not elsewhere classified
    newborn convulsions and seizures (P90)

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR PNL004
Neonatal cerebral disorders
Default principal diagnosis: inpatient Yes · outpatient Yes

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.

ICD-9-CM
779.0 Convulsions in newborn
Exact Match The mapping is direct, with no qualifiers.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2026No changes
FY 2027CurrentCurrent code set, no changesEffective October 1, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

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, 2026 through September 30, 2027.

What MS-DRG does P90 group to?

When convulsions of newborn is the principal diagnosis on an inpatient stay, it groups to MS-DRG 793, 791, with relative weights from 4.1073 to 4.2192 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 2027. 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.

Can P90 be reported with a code from G40.3?

Not as a rule. The Excludes1 note on P90 lists "benign myoclonic epilepsy in infancy (G40.3-)". An Excludes1 note means the excluded code is never reported together with this one; the only exception is when the two conditions are unrelated to each other (Official Guidelines, Section I.A.12.a).

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 2027. 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.