DR. MARK ALAN FIERRO M.D.
NPI 1114155496
Obstetrics & Gynecology in Los Gatos, CA

Q: What is Mark Fierro's NPI number?

The NPI number for Mark Fierro is 1114155496. It was assigned to this individual provider in the NPPES registry on June 25, 2009.

Q: What is Mark Fierro's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.

Q: When was this NPI record last updated?

The NPPES record for Mark Fierro was last updated on August 11, 2013. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.

Active since June 25, 2009PECOS Enrolled

15251 NATIONAL AVE, SUITE 106, LOS GATOS, CA 95032(408) 356-5111(408) 356-0654 Get Directions Write a Review

NPPES record last updated: August 11, 2013. Verified against the NPPES registry weekly; last sync: November 01, 2026.

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About Dr. Mark Alan Fierro M.d. NPPES

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

DR. MARK ALAN FIERRO M.D. (NPI 1114155496) is an individual obstetrics & gynecology provider in Los Gatos, California, licensed in California (A124997) and active in the NPI registry since June 2009. He is enrolled in Medicare PECOS and is a graduate of Saint Louis University School Of Medicine (2009).

NPPES Registry Identity

NPI1114155496

Entity TypeIndividualMale

Primary Taxonomy207V00000X

Provider Legal NameDR. MARK ALAN FIERROCredential: M.D.

Location Address15251 NATIONAL AVE, SUITE 106Los Gatos, CA 95032-2400

Mailing Address15251 National Ave, Suite 106Los Gatos, CA 95032-2400 · (408) 356-5111 · Fax (408) 356-0654

Phone(408) 356-5111

Fax(408) 356-0654

Sole ProprietorNo

Medical School CMSSaint Louis University School Of MedicineGraduated 2009

Enumeration DateJune 25, 2009

Last NPPES UpdateAugust 11, 2013

✔ NPI 1114155496 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyObstetrics & GynecologyAllopathic & Osteopathic Physicians

Taxonomy Code207V00000X

Licenses✔ Licensed in CA · A124997✔ Licensed in MO · 2009015668

Definition

An obstetrician/gynecologist possesses special knowledge, skills and professional capability in the medical and surgical care of the female reproductive system and associated disorders. This physician serves as a consultant to other physicians and as a primary physician for women.

15251 NATIONAL AVE, Los Gatos, CA 95032

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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Mark Alan Fierro M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

PECOS PAC ID5496115511

PECOS Enrollment IDI20230720000923

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.

Medicare Billing Reassignments

Medicare enrollment records show Mark Fierro reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Obstetrix Medical Group Of California, A Professional Corporation

3.4 mi

Maternal & Fetal Medicine

900 E. HAMILTON AVE, SUITE 200
Campbell, CA 95008

Reassigned Medicare billing, California enrollment
59 clinicians in this Medicare group

NPI 1629175336 (800) 463-6628

Contra Costa County

50 mi

Adult Mental Health

1420 WILLOW PASS RD
Concord, CA 94520

Reassigned Medicare billing, California enrollment
530 clinicians in this Medicare group

NPI 1023188489 (925) 646-5480

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

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 95032 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

$156.67 typical visit price

range $70.37 – $206.04

Typical copayment $39.16 (range $17.59 – $51.51)

Most-billed visit code 99204

Established Patient

$86.56 typical visit price

range $23.96 – $169.60

Typical copayment $21.64 (range $5.99 – $42.40)

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 14

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

DR. CATHERINE ANNE GRELLET M.D.

Internal Medicine

15251 NATIONAL AVE, SUITE 104
LOS GATOS, CA 95032

Santa Clara County (408) 358-7360

MS. DEBORAH JEAN BROWN PA-C

Physician Assistant (Medical)

15251 NATIONAL AVE, SUITE 108
LOS GATOS, CA 95032

Santa Clara County (408) 358-3835

R MICHAEL CONTRO MD A PROFESSIONAL CORP

Specialist

15251 NATIONAL AVE, SUITE 106
LOS GATOS, CA 95032

Santa Clara County (408) 356-5111

MISS NOELLE PEARL ADAMS DPT

Physical Therapist

15251 NATIONAL AVE, SUITE 203
LOS GATOS, CA 95032

Santa Clara County (408) 356-1990

MICHELLE M REGOLI OTR/L

Occupational Therapist (Hand)

15251 NATIONAL AVE, SUITE 203
LOS GATOS, CA 95032

Santa Clara County (408) 356-1990

SEJAL DESAI DPT

Physical Therapist

15251 NATIONAL AVE, SUITE 203
LOS GATOS, CA 95032

Santa Clara County (408) 356-1990

DR. RICHARD MICHAEL CONTRO MD

Obstetrics & Gynecology

15251 NATIONAL AVE, SUITE #106
LOS GATOS, CA 95032

Santa Clara County (408) 356-5111

AESTHETICA PLASTIC SURGICENTER

Clinic/Center (Ambulatory Surgical)

15251 NATIONAL AVE, SUITE 207
LOS GATOS, CA 95032

Santa Clara County (408) 356-0052

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 Fierro's NPI number?

The NPI number for Mark Fierro is 1114155496. It was assigned to this individual provider in the NPPES registry on June 25, 2009.

Where is Mark Fierro located?

Mark Fierro practices at 15251 National Ave Suite 106, Los Gatos, CA 95032. The listed phone number is (408) 356-5111.

What is Mark Fierro's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.

Is Mark Fierro enrolled in Medicare?

Yes. Mark Fierro is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Mark Fierro's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Mark Fierro reassigns Medicare benefits to 2 organizations: Obstetrix Medical Group Of California, A Professional Corporation (Campbell, CA) and Contra Costa County (Concord, CA). Each 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 Mark Fierro's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Mark Fierro was last updated on August 11, 2013. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 13 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.