ICD-10 Diagnosis Code Z40.01

• 597 - MALIGNANT BREAST DISORDERS WITH MCC
• 598 - MALIGNANT BREAST DISORDERS WITH CC
• 599 - MALIGNANT BREAST DISORDERS WITHOUT CC/MCC
• 600 - NON-MALIGNANT BREAST DISORDERS WITH CC/MCC
• 601 - NON-MALIGNANT BREAST DISORDERS WITHOUT CC/MCC

• V50.41 - Prphylct orgn rmvl brst

• - Admission (for) - See Also: Encounter (for);
  • - prophylactic (measure) - See Also: Encounter, prophylactic measures;
    • - organ removal - Z40.00
      • - breast - Z40.01

• - Prophylactic
  • - organ removal (for neoplasia management) - Z40.00
    • - breast - Z40.01

A mastectomy is surgery to remove a breast or part of a breast. It is usually done to treat breast cancer. Types of breast surgery include

• Total (simple) mastectomy - removal of breast tissue and nipple
• Modified radical mastectomy - removal of the breast, most of the lymph nodes under the arm, and often the lining over the chest muscles
• Lumpectomy - surgery to remove the tumor and a small amount of normal tissue around it

Which surgery you have depends on the stage of cancer, size of the tumor, size of the breast, and whether the lymph nodes are involved. Many women have breast reconstruction to rebuild the breast after a mastectomy.

Sometimes mastectomy is done to prevent breast cancer. Only high-risk patients have this type of surgery.

NIH: National Cancer Institute

• Breast lump removal (Medical Encyclopedia)
• Mastectomy (Medical Encyclopedia)
• Mastectomy - discharge (Medical Encyclopedia)

General Equivalence Map Definitions
The ICD-10 and ICD-9 GEMs are used to facilitate linking between the diagnosis codes in ICD-9-CM and the new ICD-10-CM code set. The GEMs are the raw material from which providers, health information vendors and payers can derive specific applied mappings to meet their needs.

• Approximate Flag - The approximate flag is on, indicating that the relationship between the code in the source system and the code in the target system is an approximate equivalent.
• No Map Flag - The no map flag indicates that a code in the source system is not linked to any code in the target system.
• Combination Flag - The combination flag indicates that more than one code in the target system is required to satisfy the full equivalent meaning of a code in the source system.

Present on Admission
The Present on Admission (POA) indicator is used for diagnosis codes included in claims involving inpatient admissions to general acute care hospitals. POA indicators must be reported to CMS on each claim to facilitate the grouping of diagnoses codes into the proper Diagnostic Related Groups (DRG). CMS publishes a listing of specific diagnosis codes that are exempt from the POA reporting requirement.