UB-04 Code B3: Health Care Provider Taxonomy Code

Overview

The qualifier B3 is used in UB-04 Field 81 (Code-Code Field) to indicate that the code entered in that field is a Health Care Provider Taxonomy Code. ^[1] MassHealth providers submitting paper UB-04 claims must follow the general instructions for completing the form, including proper use of qualifiers. ^[2] The B3 qualifier is distinct from the generic qualifier ZZ, which may also be used for provider taxonomy but is less specific. ^[1]

When to Use

Use qualifier B3 whenever a claim requires the reporting of a Health Care Provider Taxonomy Code in Field 81. ^[1] The B3 qualifier should be used instead of the generic ZZ qualifier when the taxonomy code is being reported specifically as a health care provider taxonomy (as opposed to a general provider identifier). ^[1] MassHealth requires electronic claim submission for most providers, but paper UB-04 forms still require accurate qualifier usage when submitted. ^[2]

Step-by-Step Claim Example

3. Immediately after the qualifier, enter the 10-digit Health Care Provider Taxonomy Code (e.g., 207R00000X). ^[1]
4. Example entry: B3207R00000X (qualifier B3 followed by taxonomy code). ^[1]
5. Repeat if multiple taxonomy codes are needed (use separate entries or additional qualifiers as allowed by payer instructions). ^[1]
6. Verify that the qualifier is B3 and not ZZ or another code. ^[1]

Common Mistakes & Audit Red Flags

• Using the generic qualifier ZZ instead of B3 – The NUBC list includes both B3 (Health Care Provider Taxonomy Code) and ZZ (Provider Taxonomy generic qualifier). Using ZZ when B3 is required may cause the claim to be rejected or misrouted. ^[1]
• Omitting the qualifier entirely – Field 81 must contain a qualifier; leaving it blank or using an incorrect qualifier can result in a claim edit or denial. ^[2]
• Placing the qualifier in the wrong position – The qualifier must be the first two characters of the field entry. ^[1]
• Using a non‑standard taxonomy code – Only codes from the official NUCC provider taxonomy list should be used. ^[1]
• Mixing qualifiers in the same field – Each entry in Field 81 should contain only one qualifier and its associated code. ^[1]

Related Codes/Fields

Code/Qualifier	Meaning	Source
B3	Health Care Provider Taxonomy Code	[1]
ZZ	Provider Taxonomy (generic qualifier)	[1]
CPT	CPT Category II Code (performance measurement)	[1]
HCP	HCPCS Code (Healthcare Common Procedure Coding System)	[1]
APR	APR-DRG (All Patient Refined Diagnosis Related Group)	[1]
ABF	Discharge Diagnosis	[1]
ABK	Adjustment Reason / internal tracking	[1]
GHC	Group Health Code	[1]
LOI	Line of Insurance	[1]
P5	Patient Diagnosis	[1]
80	Principal Diagnosis	[1]
RX	Prescription	[1]

Field 81 itself is the Code-Code Field on the UB-04 form, used to report various qualifier‑code combinations. ^[1] The qualifier B3 is one of many valid entries in this field. ^[1]

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References

[1] NUBC UB-04 Field 81 — https://www.nubc.org

[2] MassHealth UB-04 Guide — https://www.mass.gov/doc/ub-04-billing-guide-0/download