Symptoms and signs involving the skin and subcutaneous tissue (R20-R23) ICD-10-CM
The R20–R23 section covers symptoms and signs involving the skin and subcutaneous tissue with 31 ICD-10-CM diagnosis codes, of which 26 are billable in fiscal year 2026. The section is organized into the 4 code ranges listed below.
Type 2 Excludes
A type 2 excludes note represents "Not included here". An excludes2 note indicates that the condition excluded is not part of the condition represented by the code, but a patient may have both conditions at the same time. When an Excludes2 note appears under a code, it is acceptable to use both the code and the excluded code together, when appropriate.
Code Ranges in This Section 4 ranges · 31 codes
The info icon previews the code ranges inside each row and its instructional notations from the official Tabular List.
About the R20–R23 Code Range
The ICD-10 codes in the range R20-R23 are used to document various symptoms and signs related to the skin and subcutaneous tissue, including abnormal sensations, rashes, swellings, and other skin changes.
This range covers detailed sensory disturbances such as R20 codes for anesthesia, hypoesthesia, and paresthesia of the skin, helping medical coders identify specific types of numbness or abnormal sensations like tingling or excessive sensitivity (also called hyperesthesia). For example, terms like "numbness of skin" or "pins and needles" relate to R20.0-R20.3. The R21 code addresses nonspecific skin rashes, including eruptive patterns associated with infections or allergic reactions, aiding in capturing diverse rash presentations. Codes R22 encompass localized swellings, masses, or lumps anywhere on the body such as the head, neck, limbs, or trunk, with subcodes pinpointing the precise location of these findings, like "mass of skin of head" or "localized swelling of right upper limb." Lastly, the R23 codes refer to other skin changes including color alterations like cyanosis (bluish skin), pallor, flushing, spontaneous bruising, and texture changes such as thickening or peeling, which are essential to document conditions involving abnormal skin appearance and integrity.
These codes support accurate clinical documentation by linking common symptoms such as numbness, tingling, rash, swelling, or discoloration to specific ICD-10 codes, helping healthcare professionals and coders precisely characterize skin-related clinical findings for diagnosis, treatment tracking, and reporting purposes.
Questions About This Page
How many codes are in the R20-R23 range?
The R20-R23 range contains 31 ICD-10-CM diagnosis codes in FY 2026. 26 of them are billable, and the rest are category headers that organize the section.
What conditions does R20-R23 cover?
The range covers symptoms and signs involving the skin and subcutaneous tissue. The code ranges listed above break it into groups of related conditions, and each one links to its own page with the full code list.
Related References
Source: CMS FY 2026 ICD-10-CM Tabular List and order file, effective October 1, 2025 through September 30, 2026.
