ICD-10-CM 2027
ICD-10 code for congenital hypertony
From the official ICD-10-CM alphabetic index entry “Hypertony, hypertonia, hypertonicity › congenital”. Page updated September 29, 2026.
About coding congenital hypertony
The ICD-10-CM code for congenital hypertony is P94.1 (Congenital hypertonia).
Within P94 (disorders of muscle tone of newborn), P94.1 is specifically for congenital hypertonia. Related codes cover transient neonatal myasthenia gravis (P94.0), congenital hypotonia (P94.2), other disorders of muscle tone of newborn (P94.8) and disorder of muscle tone of newborn, unspecified (P94.9).
It is not a CC or MCC, so as a secondary diagnosis it doesn't change the MS-DRG severity level.
In MS-DRG v44.0, it is part of the grouping logic for DRG 794 (Neonate with Other Significant Problems, relative weight 1.4935), in MDC 15 (Newborns and Other Neonates with Conditions Originating in the Perinatal Period), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
Common questions about congenital hypertony ICD-10 codes
What is the ICD-10 code for congenital hypertony?
- P94.1 — Congenital hypertonia.
Is P94.1 billable?
- Yes. P94.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can P94.1 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict P94.1 as a principal diagnosis.
Is P94.1 a CC or MCC?
- No. P94.1 is neither a CC nor an MCC under MS-DRG v44.0.