156FX1900X Orthoptist

Definition

An orthoptist is an allied health professional skilled in evaluation and treatment of children and adults with eye movement difficulties. Their specialty is strabismus, amblyopia, and double vision.

— NUCC Health Care Provider Taxonomy, version 26.1

Where 156FX1900X sits

• Group: Eye and Vision Services Providers — code 17 of 17 in the group
• Classification: Technician/Technologist 156F00000X
• Specialization: Orthoptist 156FX1900X

Choose 156FX1900X over the general Technician/Technologist code (156F00000X) when the provider's training or certification is specifically in orthoptist; the general code covers the classification as a whole. A provider may report more than one taxonomy code on an NPI but marks one as primary.

Medicare

156FX1900X has no entry in the CMS Medicare Provider and Supplier Taxonomy Crosswalk. That usually means Medicare does not enroll this kind of provider under its own specialty — the provider can still hold an NPI and use this code on claims to other payers.

Related codes

The nearest 3 of 9 other codes under Technician/Technologist; all are on the group page.

History of 156FX1900X

NUCC's earliest recorded change to 156FX1900X is from 2023 (definition added).

• 2023-07-01 — definition added

Using 156FX1900X

The code goes in the taxonomy field of the NPI application in NPPES, and on claims where a payer asks for it — box 24J (shaded) or 33b on the CMS-1500 with the ZZ qualifier, or the PRV segment of an 837 electronic claim. Payers match it against the taxonomy on the NPI record and, for Medicare, against the specialty on the enrollment, so all three should agree. To see which code a provider uses, search their NPI in the lookup.

Sources: NUCC Health Care Provider Taxonomy code set, version 26.1 (CSV). Checked 2026-10-24. Methodology.