DR. DIANA MARIE DOUGLAS O.D.
NPI 1144452459
Optometrist in Warren, OH

Q: What is Diana Douglas's NPI number?

The NPI number for Diana Douglas is 1144452459. It was assigned to this individual provider in the NPPES registry on August 20, 2009. The provider is also known as Dr. Diana Marie Koesel.

Q: What is Diana Douglas's specialty?

The primary specialty registered for this NPI is Optometrist with taxonomy code 152W00000X.

Q: When was this NPI record last updated?

The NPPES record for Diana Douglas was last updated on November 21, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.

Active since August 20, 2009PECOS EnrolledAccepts Medicare Assignment

302 NILES CORTLAND RD NE, WARREN, OH 44484(330) 394-2020(330) 395-7194 Get Directions Write a Review

NPPES record last updated: November 21, 2025. Verified against the NPPES registry weekly; last sync: August 02, 2026.

On this page

About Dr. Diana Marie Douglas O.d. NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. DIANA MARIE DOUGLAS O.D. (NPI 1144452459) is an individual optometrist in Warren, Ohio, licensed in Ohio (5534) and active in the NPI registry since August 2009. She is enrolled in Medicare PECOS and is a graduate of Illinois College Of Optometry At Chicago (1999).

NPPES Registry Identity

NPI1144452459

Entity TypeIndividualFemale

Primary Taxonomy152W00000X

Provider Legal NameDR. DIANA MARIE DOUGLASCredential: O.D.

Location Address302 NILES CORTLAND RD NEWarren, OH 44484-1940

Mailing Address302 Niles Cortland Rd NeWarren, OH 44484-1940 · (330) 394-2020 · Fax (330) 395-7194

Phone(330) 394-2020

Fax(330) 395-7194

Sole ProprietorNo

Medical School CMSIllinois College Of Optometry At ChicagoGraduated 1999

Enumeration DateAugust 20, 2009

Last NPPES UpdateNovember 21, 2025

NPPES CertifiedNovember 21, 2025

✔ NPI 1144452459 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyOptometristEye and Vision Services Providers

Taxonomy Code152W00000X

Licenses✔ Licensed in OH · 5534✔ Licensed in NC · 1979

Definition

Doctors of optometry (ODs) are the primary health care professionals for the eye. Optometrists examine, diagnose, treat, and manage diseases, injuries, and disorders of the visual system, the eye, and associated structures as well as identify related systemic conditions affecting the eye. An optometrist has completed pre-professional undergraduate education in a college or university and four years of professional education at a college of optometry, leading to the doctor of optometry (O.D.) degree. Some optometrists complete an optional residency in a specific area of practice. Optometrists are eye health care professionals state-licensed to diagnose and treat diseases and disorders of the eye and visual system.

302 NILES CORTLAND RD NE, Warren, OH 44484

Open in Google Maps ↗

Other Names 1

Former Name (1)Dr. Diana Marie Koesel

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross and Blue Shield of Montana, Blue Cross and Blue Shield of Oklahoma, Blue Cross and Blue Shield of Texas and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Diana Marie Douglas O.d. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID1850438748

PECOS Enrollment IDI20091026000545

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency– Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 44484 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$126.12 typical visit price

range $54.34 – $166.65

Typical copayment $31.53 (range $13.58 – $41.66)

Most-billed visit code 99204

Established Patient

$68.07 typical visit price

range $17.10 – $135.40

Typical copayment $17.01 (range $4.27 – $33.85)

Most-billed visit code 99213

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Other Providers at the Same Location NPPES 3

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DOUGLAS FAMILY EYECARE, INC.

Optometrist

302 NILES CORTLAND RD NE
WARREN, OH 44484

Trumbull County (330) 394-2020

DR. CHAD JAMES DOUGLAS O.D.

Optometrist

302 NILES CORTLAND RD NE
WARREN, OH 44484

Trumbull County (330) 394-2020

WARREN EYE CLINIC INC

Ophthalmology

302 NILES CORTLAND RD NE
WARREN, OH 44484

Trumbull County (330) 395-2020

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Diana Douglas's NPI number?

The NPI number for Diana Douglas is 1144452459. It was assigned to this individual provider in the NPPES registry on August 20, 2009. The provider is also known as Dr. Diana Marie Koesel.

Where is Diana Douglas located?

Diana Douglas practices at 302 Niles Cortland Rd NE, Warren, OH 44484. The listed phone number is (330) 394-2020.

What is Diana Douglas's specialty?

The primary specialty registered for this NPI is Optometrist with taxonomy code 152W00000X.

Is Diana Douglas enrolled in Medicare?

Yes. Diana Douglas is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

What insurance does Diana Douglas accept?

Health plans from Blue Cross and Blue Shield of Montana, Blue Cross and Blue Shield of Oklahoma, Blue Cross and Blue Shield of Texas and Providence Health Plan list Diana Douglas as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Diana Douglas was last updated on November 21, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.