D91DBYZLow Dose Rate (LDR) Brachytherapy of Nasopharynx using Other Isotope

Radiation Therapy›Ear, Nose, Mouth and Throat›Brachytherapy

Billable / Specific Code

ICD-10-PCS D91DBYZ

CMS Source: FY 2026 ICD-10-PCS dataset. Effective Oct 1, 2025 – Sep 30, 2026.

D91DBYZ is a billable ICD-10-PCS procedure code for Low Dose Rate (LDR) Brachytherapy of Nasopharynx using Other Isotope. It is valid on HIPAA claims for fiscal year 2026 (October 1, 2025 through September 30, 2026).

Code Identity

ICD-10-PCS Code

D91DBYZ

Billable Status

Yes — Valid for Submission

Code Describes

Low Dose Rate (LDR) Brachytherapy of Nasopharynx using Other Isotope

Parent Code

D91

Short Description

LDR Brachytherapy of Nasopharynx using Oth Isotope

PCS Table Breakdown

Each ICD-10-PCS code is built from seven characters, each an axis of the procedure. Hover or tap the icons for the official CMS definitions.

Position	Designation	Value	Meaning
1	Section	D	Radiation Therapy
2	Body System	9	Ear, Nose, Mouth and Throat
3	Modality	1	Brachytherapy
4	TreatmentSite	D	Nasopharynx
5	ModalityQualifier	B	Low Dose Rate (LDR)
6	Isotope	Y	Other Isotope
7	Qualifier	Z	None

Convert to ICD-9-PCS

Closest ICD-9-PCS equivalents for D91DBYZ under the General Equivalence Mappings.

92.23

Approximate match.

Code History

Replaced in the FY 2026 code set by:

D91DB6Z — LDR Brachytherapy of Nasopharynx using Cesium 131

Similar Procedure Codes

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Questions About D91DBYZ

Is D91DBYZ a billable code?

Yes. D91DBYZ is a complete seven-character ICD-10-PCS code, specific enough to report Low Dose Rate (LDR) Brachytherapy of Nasopharynx using Other Isotope on inpatient claims from October 1, 2025 through September 30, 2026.

What do the characters in D91DBYZ mean?

D91DBYZ breaks down character by character: the 1st character D is the Section (Radiation Therapy); the 2nd character 9 is the Body System (Ear, Nose, Mouth and Throat); the 3rd character 1 is the Modality (Brachytherapy); the 4th character D is the TreatmentSite (Nasopharynx); the 5th character B is the ModalityQualifier (Low Dose Rate (LDR)); the 6th character Y is the Isotope (Other Isotope); the 7th character Z is the Qualifier (None).

What is the ICD-9-PCS equivalent of D91DBYZ?

Under the General Equivalence Mappings, Low Dose Rate (LDR) Brachytherapy of Nasopharynx using Other Isotope crosswalks to ICD-9-PCS 92.23. The mapping is approximate, so confirm it fits the documentation.