2027 ICD-10-CM Diagnosis Code P94.0Transient neonatal myasthenia gravis
ICD-10-CM Codes›P00–P96›P90-P96›P94
- Billable — Valid for Submission
- CC — Complication or Comorbidity
- Not Chronic
P94.0 is a billable ICD-10-CM diagnosis code for transient neonatal myasthenia gravis. 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 complication or comorbidity (CC) and moves an inpatient stay to a higher severity level within its MS-DRG family. It does not count, however, when the principal diagnosis is one of 44 closely related codes. Coders also document this condition as myasthenia gravis. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other specified and unspecified perinatal conditions.
Code Identity
Code Classification
Approximate SynonymsGuidance
Alternate terms and clinical phrases that map to this code.
- Myasthenia gravis
- Neonatal myasthenia gravis
- Neonatal neuromuscular disorder
- Transient neonatal myasthenia gravis
Instructional NotesGuidance
Instructions from the official ICD-10-CM Tabular List that apply to P94.0: 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.
- 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.
- myasthenia gravis (G70.0)
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 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 P94.0, its category, or a range that includes it.
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.
Clinical InformationClinical
Transient Neonatal Myasthenia Gravis
a condition characterized as a temporary autoimmune neuromuscular disease leading to fluctuating muscle weakness and fatigue in a newborn infant.
Patient EducationClinical
Myasthenia Gravis
Myasthenia gravis, sometimes called MG, is a chronic (long-lasting) disease that causes weakness in your voluntary muscles. The voluntary muscles are the ones that you can control. They include the muscles you use for:
The full article covers:
- What is myasthenia gravis?
- What causes myasthenia gravis?
- Who is more likely to develop myasthenia gravis?
- What are the symptoms of myasthenia gravis?
- How is myasthenia gravis diagnosed?
- What are the treatments for myasthenia gravis?
Read the full article at MedlinePlus
Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.
Convert P94.0 to ICD-9-CMHistory
The closest ICD-9-CM equivalents under the General Equivalence Mappings.
Code HistoryHistory
Questions About P94.0Overview
What is the ICD-10 code for transient neonatal myasthenia gravis?
The ICD-10-CM code for transient neonatal myasthenia gravis is P94.0 (sometimes written as P940). It is billable on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
Is P94.0 (Disorders of muscle tone of newborn) a billable code?
Yes. This is a billable ICD-10-CM code, specific enough to report transient neonatal myasthenia gravis on HIPAA-covered claims from October 1, 2026 through September 30, 2027.
What MS-DRG does P94.0 group to?
When transient neonatal myasthenia gravis 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 P94.0 a CC or MCC?
CMS lists P94.0 as a CC (complication or comorbidity) for FY 2027. Reported as a secondary diagnosis, it moves the inpatient stay to a higher-weighted DRG within its severity family. It does not count when the principal diagnosis is one of the 44 closely related codes in its exclusion list.
Can P94.0 be reported with G70.0?
Not as a rule. The Excludes1 note on P94.0 lists "myasthenia gravis (G70.0)". 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).
