Mark O'brien, D.O

NPI: 1497744247

Mark O'brien, D.O

Q: What is Mark O'brien's NPI number?

Mark O'brien's NPI number is 1497744247, a unique 10-digit identifier issued by CMS.

Q: What does Mark O'brien specialize in?

Mark O'brien specializes in Internal Medicine, taxonomy code 207R00000X.

Q: Where does Mark O'brien practice?

Mark O'brien practices in Vista, CA 92083-6052.

Q: When was Mark O'brien's NPI issued?

Mark O'brien's NPI was issued on October 14, 2005.

Q: What is Mark O'brien's provider type?

Mark O'brien is an Individual Provider under CMS NPI Type 1.

ActiveIndividual ProviderInternal Medicine

NPI issued: October 14, 2005

Quick Facts

NPI Number

1497744247

TypeIndividual

StatusActive

SpecialtyInternal Medicine

Taxonomy207R00000X — Internal Medicine

Phone

(760) 216-6500

StateCA

NPI Validation Status: Verified

✅Valid 10-digit NPI number (1497744247)

✅Active status confirmed

✅Verified by CMS NPPES Registry

✅HIPAA compliant identifier

✅Enumeration date on file (October 14, 2005)

Data source: CMS NPPES

Provider Overview

MARK O'BRIEN, D.O is a Internal Medicine provider based in Vista, CA who has been registered with CMS since 2005. This NPI is currently Active under CMS NPPES registry.

Provider Details

NPI Number1497744247

Provider TypeIndividual Provider

GenderMale

CredentialD.O

StatusActive

Enumeration DateOctober 14, 2005

Practice Location

CityVista

StateCA

ZIP Code92083-6052

Phone(760) 216-6500

Specialties & Licenses

★ Primary

SpecialtyInternal Medicine

Taxonomy Code207R00000X

License StateCA

Mailing Address

CityVista

StateCA

ZIP Code92083-6052

Phone(760) 216-6500

Same as practice location

How to Use This NPI

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For Insurance Billing

Use NPI 1497744247 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 1497744247for 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 1497744247 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 Internal Medicine

Internal Medicine physicians (internists) specialize in the prevention, diagnosis, and nonsurgical treatment of adult illnesses, managing complex chronic conditions and multi-system diseases.

Browse all Internal Medicineproviders →

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Internal Medicine Providers in the US