MARK A WELCH DO, INC
NPI 1770031312
Psychiatry & Neurology - Psychiatry in Rancho Cucamonga, CA

Q: What is Mark A Welch Do, Inc's NPI number?

The NPI number for Mark A Welch Do, Inc is 1770031312. It was assigned to this organization in the NPPES registry on September 12, 2016.

Q: What is Mark A Welch Do, Inc's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.

Active since September 12, 2016

10737 LAUREL ST, SUITE 230, RANCHO CUCAMONGA, CA 91730(909) 989-5556(909) 989-5558 Get Directions Write a Review

NPPES record last updated: September 12, 2016. Verified against the NPPES registry weekly; last sync: October 25, 2026.

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About Mark A Welch Do, Inc NPPES

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

MARK A WELCH DO, INC (NPI 1770031312) is a healthcare organization registered as a psychiatry in Rancho Cucamonga, California and active in the NPI registry since September 2016. The organization lists Mark Arnold Welch, Doctor, as its authorized official.

NPPES Registry Identity

NPI1770031312

Entity TypeOrganization

Primary Taxonomy2084P0800X

Legal Business NameMARK A WELCH DO, INC

Location Address10737 LAUREL ST, SUITE 230Rancho Cucamonga, CA 91730-3837

Mailing Address10737 Laurel St, Suite 230Rancho Cucamonga, CA 91730-3837 · (909) 989-5556 · Fax (909) 989-5558

Phone(909) 989-5556

Fax(909) 989-5558

Organization SubpartNo

Authorized OfficialMark Arnold WelchDoctor · (951) 966-5802

Enumeration DateSeptember 12, 2016

✔ NPI 1770031312 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPsychiatry & Neurology · PsychiatryAllopathic & Osteopathic Physicians

Taxonomy Code2084P0800X

License✔ Licensed in CA · 2OA8950

Definition

A Psychiatrist specializes in the prevention, diagnosis, and treatment of mental disorders, emotional disorders, psychotic disorders, mood disorders, anxiety disorders, substance-related disorders, sexual and gender identity disorders and adjustment disorders. Biologic, psychological, and social components of illnesses are explored and understood in treatment of the whole person. Tools used may include diagnostic laboratory tests, prescribed medications, evaluation and treatment of psychological and interpersonal problems with individuals and families, and intervention for coping with stress, crises, and other problems.

10737 LAUREL ST, Rancho Cucamonga, CA 91730

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Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Mark A Welch Do, Inc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 1 clinician reassigns Medicare billing to Mark A Welch Do, Inc, which bills Medicare for the services this clinician delivers.

Clinician (1)

Mark Welch, D.O.

Psychiatry

NPI 1225063555

11374 MOUNTAIN VIEW AVE
Loma Linda, CA 92354

(909) 558-6094

✔ PECOS✔ Accepts Medicare19 mi

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

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 Mark A Welch Do, Inc's NPI number?

The NPI number for Mark A Welch Do, Inc is 1770031312. It was assigned to this organization in the NPPES registry on September 12, 2016.

Where is Mark A Welch Do, Inc located?

Mark A Welch Do, Inc is located at 10737 Laurel St Suite 230, Rancho Cucamonga, CA 91730. The listed phone number is (909) 989-5556.

What is Mark A Welch Do, Inc's specialty?

The primary specialty registered for this NPI is Psychiatry & Neurology, specializing in Psychiatry, with taxonomy code 2084P0800X.

Is Mark A Welch Do, Inc enrolled in Medicare?

Yes. Mark A Welch Do, Inc is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Mark A Welch Do, Inc?

According to the CMS Revalidation Reassignment List (October 2026 release), 1 clinician (Psychiatry) reassigns their Medicare billing to Mark A Welch Do, Inc. A reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for the clinician's services. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Mark A Welch Do, Inc was last updated on September 12, 2016. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 years 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.