ICD-10-CM 2027
ICD-10 code for thirst excess
From the official ICD-10-CM alphabetic index entry “Excess, excessive, excessively › thirst”. Page updated September 29, 2026.
About coding thirst excess
The ICD-10-CM code for thirst excess is R63.1 (Polydipsia). The official index lists 1 more specific code, so check the documentation for details such as type, cause, site or severity before settling on R63.1.
Within R63 (symptoms and signs concerning food and fluid intake), R63.1 is specifically for Polydipsia. Related codes cover Anorexia (R63.0), Polyphagia (R63.2), feeding difficulties (R63.3), abnormal weight loss (R63.4), abnormal weight gain (R63.5), Underweight (R63.6) and other symptoms and signs concerning food and fluid intake (R63.8).
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 640 (Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes with MCC, relative weight 1.3395) and DRG 641 (Miscellaneous Disorders of Nutrition, Metabolism, Fluids and Electrolytes without MCC, relative weight 0.7865), in MDC 10 (Endocrine, Nutritional and Metabolic Diseases and Disorders), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.
More specific thirst excess codes (official index)
- due to deprivation of water T73.1 — Deprivation of water
Common questions about thirst excess ICD-10 codes
What is the ICD-10 code for thirst excess?
- R63.1 — Polydipsia. More specific codes apply when the documentation supports them: T73.1.
Is R63.1 billable?
- Yes. R63.1 is a billable/specific ICD-10-CM code valid for FY2027 (October 1, 2026 – September 30, 2027).
Can R63.1 be used as a principal diagnosis?
- Yes. The Medicare Code Editor doesn't restrict R63.1 as a principal diagnosis.
Is R63.1 a CC or MCC?
- No. R63.1 is neither a CC nor an MCC under MS-DRG v44.0.