Other disturbances of temperature regulation of newborn (P81) ICD-10-CM
The P81 code range covers other disturbances of temperature regulation of newborn with 4 ICD-10-CM diagnosis codes. 3 of them are billable and valid for claim submission in fiscal year 2026, and the category headers group them but cannot themselves be billed.
Codes in the P81 Range 4 codes · 3 billable
Clinical Terms in This Code Range
Definitions from the National Library of Medicine for conditions coded in the P81 range.
Drug Fever
Drug-induced fever.
Hyperthermia
An abnormal elevation of body temperature, usually as a result of inability to regulate core body temperature due to non-pathologic factors.
Hyperthermia, Induced
Abnormally high temperature intentionally induced in living things regionally or whole body. It is most often induced by radiation (heat waves, infra-red), ultrasound, or drugs.
Malignant Hyperthermia
Rapid and excessive rise of temperature accompanied by muscular rigidity following general anesthesia.
Phlebovirus
A genus of the family BUNYAVIRIDAE comprising many viruses, most of which are transmitted by Phlebotomus flies and cause PHLEBOTOMUS FEVER. The type species is RIFT VALLEY FEVER VIRUS.
Severe Fever with Thrombocytopenia Syndrome
A tick-borne infection with SEVERE FEVER WITH THROMBOCYTOPENIA SYNDROME BUNYAVIRUS of the genus Phlebovirus. It is associated with fever, THROMBOCYTOPENIA; LEUKOCYTOPENIA, and multiorgan dysfunction. It is found in parts of Asia including China, Japan, Korea and Vietnam and can be transmitted from infected domestic animals and humans.
About the P81 Code Range
ICD-10 code P81 covers disturbances in how newborns regulate their body temperature. This section includes specific conditions like environmental hyperthermia, other identified temperature regulation issues, and unspecified fever-related disorders in newborns.
The code P81.0 is used for cases of environmental hyperthermia in newborns, where overheating occurs due to external temperature factors, sometimes called "hyperthermia" or "environmentally-induced hyperthermia." Meanwhile, P81.8 applies to other specified temperature problems such as biphasic fever, neonatal dehydration, or brief fever episodes termed "transitory fever of newborn." If the exact cause or type of temperature disturbance isn’t identified, P81.9 is used for unspecified cases, including a wide range of fever descriptions like viral fever, sweating fever, and intermittent or continuous fever patterns common in newborns. Understanding these synonyms helps medical coders accurately select the appropriate ICD-10 code for newborns experiencing abnormal temperature regulation. This ensures precise documentation for conditions affecting newborn temperature responses, differentiating among causes like environmental heat, dehydration, or unknown fever origins.
Questions About This Page
How many billable codes are in the P81 range?
Of the 4 codes in this range, 3 are billable and valid for claim submission from October 1, 2025 through September 30, 2026. Category header codes group them but cannot be reported on claims.
What does the P81 range classify?
The range classifies other disturbances of temperature regulation of newborn. Each code links to its own reference page with billing status, MS-DRG grouping, coding notes, and clinical information.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
