R22.0Localized swelling, mass and lump, head

R22.0 is the ICD-10-CM diagnosis code for localized swelling, mass and lump, head. It belongs to category R22 (localized swelling, mass and lump of skin and subcutaneous tissue), block R20-R23 (symptoms and signs involving the skin and subcutaneous tissue) and chapter 18 (symptoms, signs and abnormal clinical and laboratory findings, not elsewhere classified). It is billable, so it can be reported on its own for dates of service from October 1, 2026 through September 30, 2027.

Within R22 (localized swelling, mass and lump of skin and subcutaneous tissue), R22.0 is specifically for localized swelling, mass and lump, head. Related codes cover neck (R22.1), trunk (R22.2), upper limb (R22.3), lower limb (R22.4) and unspecified (R22.9).

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 606 (Minor Skin Disorders with MCC, relative weight 1.5728) and DRG 607 (Minor Skin Disorders without MCC, relative weight 0.8772), in MDC 09 (Diseases and Disorders of the Skin, Subcutaneous Tissue and Breast), as a principal or secondary diagnosis. The DRG a claim lands in depends on the principal diagnosis, procedures and any CC/MCC secondary diagnoses.

It has been part of ICD-10-CM since the code set took effect on October 1, 2015 and hasn't changed since.

Before ICD-10, this condition was coded in ICD-9-CM as 782.2 (localized superficial swelling, mass, or lump) and 784.2 (swelling, mass, or lump in head and neck).