2026 ICD-10-CM Diagnosis Code R63.1Polydipsia

ICD-10-CM Codes›R00–R99›R50-R69›R63

ICD-10-CM R63.1
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

R63.1 is a billable ICD-10-CM diagnosis code for polydipsia. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 640 through 641. As a symptom code, it should not be used as a principal diagnosis once a related definitive diagnosis has been established. Coders also document this condition as defective osmoregulation. In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Other general signs and symptoms.

Code Identity

ICD-10-CM Code
R63.1
Billable Status
Yes — Valid for Submission
Code Describes
Polydipsia
Short Description
Polydipsia
Same as the full description in the CMS dataset.
Parent Code
R63
Symptoms and signs concerning food and fluid intake

Code Classification

ChapterR00–R99Symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified
SectionR50-R69General symptoms and signs
CategoryR63Symptoms and signs concerning food and fluid intake
This CodeR63.1Polydipsia

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Defective osmoregulation
  • Excessive thirst
  • Increased thirst
  • Organic primary polydipsia
  • Osmoregulation defect - excess thirst
  • Primary polydipsia

Tabular List NotesGuidance

Coding notes and annotation back-references applicable to this code.

Inclusion Terms

  • Excessive thirst

Index to Diseases and InjuriesGuidance

Alphabetical index entries that point to this code.

External Cause of Injuries IndexGuidance

References for this code in the External Cause of Injuries Index.

    • Excess, excessive, excessively
      • thirst
    • Polydipsia
    • Thirst, excessive

Clinical ClassificationClinical

AHRQ’s CCSR groups this code into broader clinical categories.

CCSR SYM016
Other general signs and symptoms
Default principal diagnosis: inpatient Yes · outpatient Yes

Clinical InformationClinical

  • Polydipsia

    excessive thirst manifested by excessive fluid intake. it is characteristic of many diseases such as diabetes mellitus; diabetes insipidus; and nephrogenic diabetes insipidus. the condition may be psychogenic in origin.

  • Polydipsia, Psychogenic

    a clinical disorder characterized by excessive fluid intake (polydipsia); hyponatremia; and polyuria in schizophrenia and other psychiatric disorders. impaired water metabolism in psychogenic polydipsia can result in water intoxication.

  • Dipsogenic Diabetes Insipidus|Primary Polydipsia

    diabetes insipidus caused by excessive intake of water due to psychological factors or damage to the thirst-regulating mechanism.

  • Polydipsia

    chronic excessive intake of water; it may be from an organic cause, such as the dehydration of diabetes mellitus, diabetes insipidus, or a reaction to medication, or from a psychological cause. when untreated it can lead to water intoxication.

Convert R63.1 to ICD-9-CMHistory

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

ICD-9-CM
783.5 Polydipsia
Exact Match The mapping is direct, with no qualifiers.

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 R63.1Overview

Is R63.1 (Symptoms and signs concerning food and fluid intake) a billable code?

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

What MS-DRG does R63.1 group to?

When polydipsia is the principal diagnosis on an inpatient stay, it groups to MS-DRG 640, 641, with relative weights from 0.7782 to 1.3356 depending on complications. Higher weights mean higher Medicare reimbursement.

Can R63.1 be a principal diagnosis?

Use it with care. This is a symptom code, so once a definitive diagnosis explaining the polydipsia is established, that condition takes the principal position instead.

What is the ICD-9 equivalent of R63.1?

Under the General Equivalence Mappings, polydipsia converts to ICD-9-CM 783.5 (polydipsia). The mapping is a direct match.

Footnotes

[1] Not chronic - A diagnosis code that does not fit the criteria for chronic condition (duration, ongoing medical treatment, and limitations) is considered not chronic. Some codes designated as not chronic are acute conditions. Other diagnosis codes that indicate a possible chronic condition, but for which the duration of the illness is not specified in the code description (i.e., we do not know the condition has lasted 12 months or longer) also are considered not chronic.