ICD-10 Code I97.2 – Postmastectomy lymphedema syndrome (2026): Diagnosis, Symptoms & Billing Guide
2026 ICD-10-CM Diagnosis Code I97.2 – Postmastectomy lymphedema syndrome
What it is
I97.2 identifies lymphedema that develops after mastectomy, usually from disruption of lymphatic drainage in the arm or chest wall. Use it for the post-surgical swelling syndrome, not for generalized edema.
Clinical signs
Typical findings include persistent swelling, heaviness, tightness, or reduced range of motion in the affected limb. Clinical features vary; refer to documentation for laterality, chronicity, and whether the edema is attributed to prior breast surgery.
When to use this code
Use I97.2 when the record documents lymphedema as a complication or sequela of mastectomy. It is appropriate when the provider links the swelling to prior breast cancer surgery, even if the original operation was remote. If documentation only says “arm swelling,” you need clarification before coding this diagnosis.
Do not use for
Do not use this code for edema from heart, renal, venous, or medication-related causes. Do not use it when the chart does not connect the swelling to mastectomy; Check documentation.
Coding tip
Look for explicit provider wording such as “postmastectomy lymphedema” or “lymphedema due to mastectomy” before assigning I97.2.