2026 ICD-10-CM Diagnosis Code I97.2Postmastectomy lymphedema syndrome

ICD-10-CM Codes›I00–I99›I95-I99›I97

ICD-10-CM I97.2
CMSSource: CMS FY 2026 ICD-10-CM dataset · Effective Oct 1, 2025 – Sep 30, 2026

I97.2 is a billable ICD-10-CM diagnosis code for postmastectomy lymphedema syndrome. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026) and groups to MS-DRG 600 through 601. The code is restricted by the Medicare Code Editor to adult patients (age 15 through 124). In AHRQ's Clinical Classifications Software (CCSR), this diagnosis falls under Postprocedural or postoperative circulatory system complication.

Code Identity

ICD-10-CM Code
I97.2
Billable Status
Yes — Valid for Submission
Code Describes
Postmastectomy lymphedema syndrome
Short Description
Postmastectomy lymphedema syndrome
Same as the full description in the CMS dataset.
Parent Code
I97
Intraoperative and postprocedural complications and disorders of circulatory system, not elsewhere classified

Code Classification

ChapterI00–I99Diseases of the circulatory system
SectionI95-I99Other and unspecified disorders of the circulatory system
CategoryI97Intraoperative and postprocedural complications and disorders of circulatory system, not elsewhere classified
This CodeI97.2Postmastectomy lymphedema syndrome

Code EditsBilling

Medicare Code Editor checks that affect claim validity for I97.2.

Adult diagnoses
The Medicare Code Editor detects inconsistencies in adult cases by checking a patient's age and any diagnosis on the patient's record. The adult code edits apply to patients age range is 15–124 years inclusive (e.g., senile delirium, mature cataract).

Approximate SynonymsGuidance

Alternate terms and clinical phrases that map to this code.

  • Bilateral upper limb edema
  • Edema of left upper limb
  • Edema of right upper limb
  • Lymphedema of bilateral upper limbs
  • Lymphedema of left upper limb
  • Lymphedema of right upper limb
  • Lymphedema of upper limb
  • Postmastectomy lymphedema syndrome
  • Postmastectomy lymphedema syndrome of bilateral upper limbs
  • Postmastectomy lymphedema syndrome of left upper limb
  • Postmastectomy lymphedema syndrome of right upper limb
  • Postsurgical lymphedema

Tabular List NotesGuidance

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

Inclusion Terms

  • Elephantiasis due to mastectomy
  • Obliteration of lymphatic vessels

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.

    • Complication(s) (from) (of)
      • circulatory system
        • postprocedural
          • lymphedema after mastectomy
    • Complication(s) (from) (of)
      • surgical procedure (on)
        • elephantiasis or lymphedema
          • postmastectomy
    • Complication(s) (from) (of)
      • surgical procedure (on)
        • lymphedema
          • postmastectomy
    • Complication(s) (from) (of)
      • surgical procedure (on)
        • postmastectomy lymphedema syndrome
    • Edema, edematous(infectious) (pitting) (toxic)
      • lymphatic
        • due to mastectomy
    • Elephantiasis(nonfilarial)
      • due to
        • mastectomy
    • Elephantiasis(nonfilarial)
      • lymphatic vessel
        • due to mastectomy
    • Elephantiasis(nonfilarial)
      • surgical
        • postmastectomy
    • Lymphedema(acquired)
      • postmastectomy
    • Lymphedema(acquired)
      • surgical NEC
        • postmastectomy (syndrome)
    • Obliteration
      • lymphatic vessel
        • due to mastectomy
    • Postmastectomy lymphedema(syndrome)
    • Syndrome
      • postmastectomy lymphedema

Clinical ClassificationClinical

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

CCSR CIR038
Postprocedural or postoperative circulatory system complication
Default principal diagnosis: inpatient Yes · outpatient Yes

Patient EducationClinical

Lymphedema

Lymphedema is the name of a type of swelling. It happens when lymph builds up in your body's soft tissues. Lymph is a fluid that contains white blood cells that defend against germs. It can build up when the lymph system is damaged or blocked. It usually happens in the arms or legs.

Read the full article at MedlinePlus

Courtesy of MedlinePlus, a service of the U.S. National Library of Medicine.

Convert I97.2 to ICD-9-CMHistory

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

ICD-9-CM
457.0 Postmastect lymphedema
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 I97.2Overview

Is I97.2 a billable code?

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

What MS-DRG does I97.2 group to?

When postmastectomy lymphedema syndrome is the principal diagnosis on an inpatient stay, it groups to MS-DRG 600, 601, with relative weights from 0.6050 to 1.0416 depending on complications. Higher weights mean higher Medicare reimbursement.

Who can I97.2 be reported for?

The Medicare Code Editor checks postmastectomy lymphedema syndrome against patient demographics: this code is intended for adult patients (age 15 through 124). Claims outside these limits are flagged as inconsistent.

What is the ICD-9 equivalent of I97.2?

Under the General Equivalence Mappings, postmastectomy lymphedema syndrome converts to ICD-9-CM 457.0 (postmastect lymphedema). 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.