Q85.81 – PTEN hamartoma tumor syndrome

ICD-10-CM 2027 diagnosis code · Other congenital malformations

Billable code

ICD-10-CM code Q85.81

Code: Q85.81 (claims format: Q8581)
Description: PTEN hamartoma tumor syndrome
Billable: Yes – valid for HIPAA-covered transactions
Valid for: Dates of service October 1, 2026 – September 30, 2027 (FY2027)
Chapter: 17. Congenital malformations, deformations, chromosomal abnormalities, and genetic disorders (Q00-QA1)
Block: Q80-Q89 Other congenital malformations
Parent codes: Q85 › Q85.8

Notes for Q85.81

Applicable to:

PHTS
PTEN related Cowden syndrome

Code also:

, if applicable, genetic susceptibility to malignant neoplasm (Z15.0-)

Notes inherited from parent codes

Instructional notes at a category or block level apply to every code below it.

Q85 – Phakomatoses, not elsewhere classified

Excludes1 (not coded here):

ataxia telangiectasia [Louis-Bar] (G11.3)
familial dysautonomia [Riley-Day] (G90.1)

Q85.8 – Other phakomatoses, not elsewhere classified

Excludes1 (not coded here):

Meckel-Gruber syndrome (Q61.9)

Index terms for Q85.81

Entries in the ICD-10-CM alphabetic index that lead to this code:

Related codes in Q85.8

Q85.82 – Other Cowden syndromeBillable
Q85.83 – Von Hippel-Lindau syndromeBillable
Q85.89 – Other phakomatoses, not elsewhere classifiedBillable

Frequently asked questions

What is ICD-10 code Q85.81?

Q85.81 is the ICD-10-CM code for pTEN hamartoma tumor syndrome, in the block Q80-Q89 (Other congenital malformations).

Is Q85.81 a billable code?

Yes. Q85.81 is a billable/specific code that can be used to indicate a diagnosis for reimbursement purposes.

What category does Q85.81 belong to?

It belongs to category Q85 – Phakomatoses, not elsewhere classified.

Source: CDC/NCHS ICD-10-CM FY2027 code files, tabular list and index. Reference only – code assignment must follow the official ICD-10-CM guidelines and documentation in the medical record.