John Warren, MD

NPI: 1386634400

John Warren, MD

Q: What is John Warren's NPI number?

John Warren's NPI number is 1386634400, a unique 10-digit identifier issued by CMS.

Q: What does John Warren specialize in?

John Warren specializes in Ophthalmology, taxonomy code 207W00000X.

Q: Where does John Warren practice?

John Warren practices in Greenfield, MA 01301.

Q: When was John Warren's NPI issued?

John Warren's NPI was issued on October 28, 2005.

Q: What is John Warren's provider type?

John Warren is an Individual Provider under CMS NPI Type 1.

ActiveIndividual ProviderOphthalmology

NPI issued: October 28, 2005

Quick Facts

NPI Number

1386634400

TypeIndividual

StatusActive

SpecialtyOphthalmology

Taxonomy207W00000X — Ophthalmology

Phone

(413) 774-7016

StateMA

NPI Validation Status: Verified

✅Valid 10-digit NPI number (1386634400)

✅Active status confirmed

✅Verified by CMS NPPES Registry

✅HIPAA compliant identifier

✅Enumeration date on file (October 28, 2005)

Data source: CMS NPPES

Provider Overview

JOHN WARREN, MD is a Ophthalmology provider based in Greenfield, MA who has been registered with CMS since 2005. This NPI is currently Active under CMS NPPES registry.

Provider Details

NPI Number1386634400

Provider TypeIndividual Provider

GenderMale

CredentialMD

StatusActive

Enumeration DateOctober 28, 2005

Practice Location

CityGreenfield

StateMA

ZIP Code01301

Phone(413) 774-7016

Specialties & Licenses

★ Primary

SpecialtyOphthalmology

Taxonomy Code207W00000X

License StateMA

Mailing Address

CityGreenfield

StateMA

ZIP Code01301

Phone(413) 774-7016

Same as practice location

How to Use This NPI

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For Insurance Billing

Use NPI 1386634400 in Box 33 of the CMS-1500 claim form. This number is required by all major insurance carriers to identify the billing provider and process electronic medical claims.

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For Credentialing

Reference NPI 1386634400for provider credential verification. Hospital systems, state licensing boards, and CAQH directories query this number to verify the provider's active clinical status.

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For Patients

Share NPI 1386634400 with your insurance company. If you need to verify out-of-network benefits or file a reimbursement claim, your insurance provider will require this number to process it.

About Ophthalmology

Specialists in Ophthalmology provide expert clinical care within their specific domain, focusing on the diagnosis, treatment, and management of conditions relevant to their field of practice.

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