What is Jack Greenan's NPI number?

Jack Greenan's National Provider Identifier (NPI) is 1639613979, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Jack Greenan's specialty?

Jack Greenan is listed in the NPPES registry with a primary specialty of Optometrist (Eye and Vision Services Providers).

Where is Jack Greenan located?

Jack Greenan's practice location on file with NPPES is 2703 Richmond Rd, Texarkana, TX 75503-2328.

What is Jack Greenan's phone number?

The practice phone number listed in the NPPES registry for Jack Greenan is (903) 838-0783.

Does Jack Greenan accept Medicare?

Jack Greenan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.

Is Jack Greenan's NPI active?

Yes — Jack Greenan's NPI (1639613979) is active in the NPPES registry as of the last update on 2019-06-03.

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Jack Greenan

NPI 1639613979 · Optometrist · Texarkana, TX

Jack Greenan is a Optometrist provider in Texarkana, TX (NPI 1639613979).

Provider details

NPI number: 1639613979
Entity type: Individual
Primary specialty: OptometristEye and Vision Services Providers
Sex: Male
Sole proprietor: No
License: 9121T (TX)

Practice location

2703 Richmond Rd

Texarkana, TX 75503-2328

Phone: (903) 838-0783

Street-level locationGet directions

More TX providers

Mailing address

2703 Richmond Rd

Texarkana, TX 75503-2328

Specialties & taxonomies

OptometristPrimary152W00000XLicense 9121T (TX)
Eye and Vision Services Providers

Enrolled with Medicare as Practitioner - Optometry · source: CMS PECOS Public Provider Enrollment (2026.04.01)

Profile Score

Detailed profile(75/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure33% of score
9 yrs in NPPES registry
Profile completeness33% of score
100% of core fields populated
Practice footprint20% of score
1 documented practice location
Open Payments transparency13% of score
Has Open Payments disclosures (2024)

Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.

Transparency — industry payments

Based on CMS Open Payments, 2024; not all care is captured.

$526 across 11 records (Open Payments 2024)

Open Payments discloses payments and transfers of value (meals, travel, consulting, research, royalties) from drug and device makers to providers. This is a transparency signal, not a verdict — such payments are legal and common, and their presence is neither an endorsement nor a criticism. Source: CMS Open Payments, program year 2024.

Enumerated: 2016-12-06
Last updated: 2019-06-03

Frequently asked questions

What is Jack Greenan's NPI number?: Jack Greenan's National Provider Identifier (NPI) is 1639613979, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
What is Jack Greenan's specialty?: Jack Greenan is listed in the NPPES registry with a primary specialty of Optometrist (Eye and Vision Services Providers).
Where is Jack Greenan located?: Jack Greenan's practice location on file with NPPES is 2703 Richmond Rd, Texarkana, TX 75503-2328.
What is Jack Greenan's phone number?: The practice phone number listed in the NPPES registry for Jack Greenan is (903) 838-0783.
Does Jack Greenan accept Medicare?: Jack Greenan is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
Is Jack Greenan's NPI active?: Yes — Jack Greenan's NPI (1639613979) is active in the NPPES registry as of the last update on 2019-06-03.

Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.

Provider details

Practice location

Mailing address

Specialties & taxonomies

Profile Score

Transparency — industry payments

Registry dates

Frequently asked questions

Specialties & taxonomies

Profile Score

Transparency — industry payments

Frequently asked questions