P94.1 ICD-10-CM Code: Congenital hypertonia

Indexed Clinical Terms (1)

Official source data — entries quoted as published, in the Index’s own lookup phrasing

Clinical term phrases from the official ICD-10-CM Index to Diseases and Injuries that map to this code. These are alphabetic-index entries shown as the Index writes them — lookup phrasing, not necessarily the wording of a final diagnosis.

• Hypertony, hypertonia, hypertonicity, congenital

Don’t confuse P94.1 with…

MedCoder analysis — pairs from this code’s official notes, distinctions written by MedCoder

The codes most likely to be picked instead of P94.1 — named in its own official notes, or sharing its laterality or encounter family — with what separates them and which documentation moves the case. Each links to the full comparison.

• P94.9— Specificity relationship (Review)

  Overlapping diagnoses in the same category.

  Overlapping codes in the same category — the documentation decides which is the more specific fit.

  What moves you there: A record that documents no more than “Disorder of muscle tone of newborn, unspecified” takes P94.9; specificity in the record moves it back here.

  Full comparison: P94.1 vs P94.9 →

Relationships are read from this code's own official notes, its laterality siblings and its encounter family; the wording of each distinction is MedCoder editorial, and the documentation named in each “what moves you there” line is the official note phrase or sibling title itself. Source: CMS ICD-10-CM tabular instructional notes; ICD-10-CM Official Guidelines, Section I.A.12.a.

Verify Before Coding

• No Medicare Code Editor or MS-DRG Definitions Manual restrictions apply to this code.

From the code registry, the Medicare Code Editor, and the MS-DRG Definitions Manual. Check it against a full claim in Claim Check.

Relationships & Classification

MedCoder structured relationships — computed from published CMS and AHRQ datasets

MS-DRG Grouper Relationships (FY2026)

Potential MS-DRG participation — not a DRG assignment.

FY2026 MS-DRG: not on the CMS CC/MCC list — as a secondary diagnosis this code does not change MS-DRG severity for that release.

Named in the grouper logic of 1 MS-DRG: DRG 794 (MDC 15).

From the CMS MS-DRG Definitions Manual (Appendices B and C). Actual DRG assignment depends on the complete claim.

Clinical classification (AHRQ CCSR):PNL013 — Other specified and unspecified perinatal conditions (default).

Clinical Classifications Software Refined (CCSR) for ICD-10-CM Diagnoses. Healthcare Cost and Utilization Project (HCUP), Agency for Healthcare Research and Quality.

Related Codes

Same clinical category (CCSR)

AHRQ's Clinical Classifications Software groups these diagnoses under the same clinical category (Other specified and unspecified perinatal conditions).

P83.4 — Breast engorgement of newborn, P83.5 — Congenital hydrocele, P83.6 — Umbilical polyp of newborn, P83.8 — Other specified conditions of integument specific to newborn, P83.81 — Umbilical granuloma, P83.88 — Other specified conditions of integument specific to newborn, P83.9 — Condition of the integument specific to newborn, unspecified, P93.0 — Grey baby syndrome, P93.8 — Other reactions and intoxications due to drugs administered to newborn, P94.0 — Transient neonatal myasthenia gravis, P94.2 — Congenital hypotonia, P94.8 — Other disorders of muscle tone of newborn, P94.9 — Disorder of muscle tone of newborn, unspecified, P95 — Stillbirth, P96.0 — Congenital renal failure, P96.3 — Wide cranial sutures of newborn, P96.5 — Complication to newborn due to (fetal) intrauterine procedure, P96.81 — Exposure to (parental) (environmental) tobacco smoke in the perinatal period, P96.82 — Delayed separation of umbilical cord, P96.83 — Meconium staining, +74 more

Same Index main term, other category

The ICD-10-CM Index to Diseases and Injuries files this code under the main term “Hypertony, hypertonia, hypertonicity”; these codes share that main term but sit in a different category of the Tabular List.

F45.8 — Other somatoform disorders (stomach, psychogenic), K31.89 — Other diseases of stomach and duodenum (stomach), N31.8 — Other neuromuscular dysfunction of bladder (bladder), O62.4 — Hypertonic, incoordinate, and prolonged uterine contractions (uterus, uterine)

Contextual Map

Every relationship of P94.1 in one view: hierarchy, official tabular instructions in both directions, clinical classification, risk adjustment, MS-DRG participation, index terms and change history — each edge carrying the CMS source it derives from.

Hierarchy

• P00-P96 — Chapter 16: Certain Conditions Originating in the Perinatal Period (P00-P96) (P00-P96)[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• P90-P96 — Other disorders originating in the perinatal period[Hierarchy]— CMS ICD-10-CM tabular structure · icd10cm-fy2026

Clinical classification (CCSR)

• PNL013 — Other specified and unspecified perinatal conditions[CCSR]— AHRQ CCSR for ICD-10-CM Diagnoses (HCUP)

MS-DRG Grouper

• DRG 794 — NEONATE WITH OTHER SIGNIFICANT PROBLEMS[MS-DRG]: “NEONATE WITH OTHER SIGNIFICANT PROBLEMS (MDC 15)”— CMS MS-DRG Definitions Manual (Appendix B) · FY2026

MDC crossing

• MDC 15 — Newborns and Other Neonates with Conditions Originating in Perinatal Period[MDC crossing]: “Newborns and Other Neonates with Conditions Originating in Perinatal Period — the grouper's crossing between diagnoses and procedures: a principal diagnosis sets the MDC, and same-MDC procedures move the stay to its surgical DRGs.”— CMS MS-DRG Definitions Manual · FY2026

Index entries

• Hypertony, hypertonia, hypertonicity, congenital[Index term]— CMS ICD-10-CM Index to Diseases and Injuries · icd10cm-fy2026

Nearest codes

• P94 — Disorders of muscle tone of newborn[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• P94.0 — Transient neonatal myasthenia gravis[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• P94.2 — Congenital hypotonia[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• P94.8 — Other disorders of muscle tone of newborn[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026
• P94.9 — Disorder of muscle tone of newborn, unspecified[Sibling]— CMS ICD-10-CM tabular structure · icd10cm-fy2026

Change history

• FY2016 — In the code set at ICD-10-CM adoption [Change history]— CMS release files (code change ledger) · icd10cm-fy2016

Sources for this page

Codes, titles, notes, index terms and mappings on this page are transcribed from the datasets below. Relationships MedCoder computed and text MedCoder wrote are labelled where they appear.

Code, title, tabular notes and index terms Official source data

CMS/CDC ICD-10-CM FY2026 tabular list, index and tables, effective October 1, 2025 Release, file and checksum · Publisher’s page

Claim edits Official source data

CMS Definitions of Medicare Code Edits — v43.1 (April 2026) Release, file and checksum · Publisher’s page

Inpatient payment groups Official source data

CMS MS-DRG Definitions Manual (incl. Appendix B diagnosis index, Appendix C CC/MCC list, Appendix E procedure index) and IPPS Final Rule tables — v43 Release, file and checksum · Publisher’s page

Change history and date-of-service validity Official source data

CMS ICD-10-CM release addenda, ingested release by release into the change ledger Release, file and checksum · Publisher’s page

Comparisons, relationships and the contextual map MedCoder structured relationship

Computed by MedCoder from the tabular notes and tables above; every derived relationship is marked as derived where it appears

Summary and FAQ answers MedCoder explanation

Written by MedCoder to explain the sources above: drafted with AI assistance, checked by a person against the release files, and labelled as MedCoder text where it appears. Not official text.

Labels on this page: Official source data · MedCoder structured relationship · MedCoder explanation. How to read the labels · All data sources and release dates

Nearest Codes in This Family

Official ICD-10-CM classifications closest to P94.1 in its code family, with their registry titles.

• P94 — Disorders of muscle tone of newborn
• P94.0 — Transient neonatal myasthenia gravis
• P94.2 — Congenital hypotonia
• P94.8 — Other disorders of muscle tone of newborn
• P94.9 — Disorder of muscle tone of newborn, unspecified

View all codes in the P94 family