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CPT® Modifier 0K
Deleted

Official Description

MSH2, MSH6, or PMS2 (HNPCC, mismatch repair genes)

© Copyright 2026 American Medical Association. All rights reserved.

Short Descr	MSH2, MSH6, or PMS2 (HNPCC, mismatch repair genes)
Medium Descr	MSH2, MSH6, or PMS2 (HNPCC, mismatch repair genes)

Modifiers

-/+ Deleted, Replaced, Expanded Codes

0A-9Z Genetic Testing Code Modifiers

0A-0Z Neoplasia (Solid Tumor, Excluding Sarcoma and Lymphoma)

0A BRCA1 (hereditary breast/ovarian cancer)

0B BRCA2 (hereditary breast cancer)

0C Neurofibromin (neurofibromatosis, type 1)

0D Merlin (neurofibromatosis, type 2)

0E c-RET (multiple endocrine neoplasia, types 2A/B, familial medullary thyroid carcinoma)

0F VHL (Von Hippel Lindau disease, renal carcinoma)

0G SDHD (hereditary paraganglioma)

0H SDHB (hereditary paraganglioma)

0I ERRB2, commonly called Her-2/neu

0J MLH1 (HNPCC, mismatch repair genes)

0K MSH2, MSH6, or PMS2 (HNPCC, mismatch repair genes)

0L APC (hereditary polyposis coli)

0M Rb (retinoblastoma)

0N TP53, commonly called p53

0O PTEN (CowdenÃ¢â‚¬â„¢s syndrome)

0P KIT, also called CD117 (gastrointestinal stromal tumor)

0Z Solid tumor gene, not otherwise specified

Date	Action	Notes
2013-01-01	Deleted	Removed from the CPT codebook.

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