Question 1

What is ICD-10 code Z13.850?

Accepted Answer

Z13.850 is the ICD-10-CM diagnosis code for Encounter for screening for traumatic brain injury. A preventive health visit to screen for traumatic brain injury, often in patients with history of head trauma or concussions. Z13.850 is a billable code, meaning it can be reported on a claim as a primary or secondary diagnosis when supported by documentation. Z13.850 is part of the FY2026 ICD-10-CM code set published by the CMS National Center for Health Statistics and used on Medicare, Medicaid, and commercial claims in the United States.

Question 2

Is Z13.850 an HCC code?

Accepted Answer

No. Z13.850 is a billable ICD-10-CM code but does not map to any payment HCC category under the CMS-HCC V28, V24, ESRD, or RxHCC risk adjustment models. It can still be reported on Medicare Advantage encounter data submissions, but it does not contribute to the beneficiary's Risk Adjustment Factor (RAF) score and therefore does not affect the risk-adjusted capitation payment to the plan. V28 reached 100% phase-in for payment year 2026.

Question 3

Is Z13.850 billable?

Accepted Answer

Yes. Z13.850 is a billable ICD-10-CM code that can be reported on professional and institutional claims as a primary or secondary diagnosis when the provider documentation supports the specific condition described. Billable codes in ICD-10-CM are coded to the highest level of specificity available for the documented diagnosis. Z13.850 is current for fiscal year 2026 and remains in the active CMS ICD-10-CM code set published by the National Center for Health Statistics.

Question 4

What is the V28 vs V24 difference for Z13.850?

Accepted Answer

Z13.850 does not map to a payment HCC under either the CMS-HCC V28 risk adjustment model or the older V24 model. V28 reached 100% phase-in for payment year 2026, replacing V24 which was used during the PY2024–PY2025 transition. Because neither model rewards Z13.850 with a risk adjustment factor, it contributes zero to a Medicare Advantage beneficiary's RAF score in either version. Coders should check whether provider documentation supports a more specific child code that does map to a payment HCC.

Question 5

What should coders know when reporting Z13.850?

Accepted Answer

Use for screening encounters to identify potential brain injury effects in asymptomatic or minimally symptomatic patients Do not use if the patient has acute head trauma; use appropriate injury codes instead

HCC Buddy Code Card

Z13.850

Is Z13.850 an HCC code?

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Child Codes

Code Hierarchy

Open Z13.850 in the Interactive Encoder

Z13.850 ICD-10-CM Code: Encounter for screening for traumatic brain injury

HCC Buddy Code Card

Z13.850

Is Z13.850 an HCC code?

What This Code Means

Coding Tips

Child Codes

Code Hierarchy

Open Z13.850 in the Interactive Encoder