2026 ICD-10-CM Diagnosis Code P94.1Congenital hypertonia

ICD-10-CM Codes›P00–P96›P90-P96›P94

ICD-10-CM P94.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

P94.1 is a billable ICD-10-CM diagnosis code for congenital hypertonia. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 794. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified perinatal conditions.

Code Identity

ICD-10-CM Code
P94.1
Billable Status
Yes — Valid for Submission
Code Describes
Congenital hypertonia
Short Description
Congenital hypertonia
Same as the full description in the CMS dataset.
Parent Code
P94
Disorders of muscle tone of newborn

Code Classification

ChapterP00–P96Certain conditions originating in the perinatal period
SectionP90-P96Other disorders originating in the perinatal period
CategoryP94Disorders of muscle tone of newborn
This CodeP94.1Congenital hypertonia

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Congenital hypertonia

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 PNL013
Other specified and unspecified perinatal conditions
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Neuromuscular Disorders

Neuromuscular disorders affect your neuromuscular system. They can cause problems with:

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Convert P94.1 to ICD-9-CMHistory

The closest ICD-9-CM equivalents under the General Equivalence Mappings.

ICD-9-CM
779.89 Perinatal condition NEC
Approximate The match is approximate rather than exact.

Code HistoryHistory

FY 2016AddedAdded to the ICD-10-CM code setEffective October 1, 2015, the first year of ICD-10-CM.
FY 2017–2025No changes
FY 2026CurrentCurrent code set, no changesEffective October 1, 2025 through September 30, 2026.

Questions About P94.1Overview

What is the ICD-10 code for congenital hypertonia?

The ICD-10-CM code for congenital hypertonia is P94.1 (sometimes written as P941). It is billable on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

Is P94.1 (Disorders of muscle tone of newborn) a billable code?

Yes. This is a billable ICD-10-CM code, specific enough to report congenital hypertonia on HIPAA-covered claims from October 1, 2025 through September 30, 2026.

What MS-DRG does P94.1 group to?

When congenital hypertonia is the principal diagnosis on an inpatient stay, it groups to MS-DRG 794 (neonate with Other Significant Problems), which carries a relative weight of 1.4759. Higher weights mean higher Medicare reimbursement.

What is the ICD-9 equivalent of P94.1?

Under the General Equivalence Mappings, congenital hypertonia converts to ICD-9-CM 779.89 (perinatal condition NEC). The mapping is approximate, so confirm the match fits the documentation.