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MARK SHAFFER M.D.
NPI 1255436804
Internal Medicine in La Mesa, CA

Active since September 14, 2006PECOS Enrolled
7877 PARKWAY DR, SUITE1B, LA MESA, CA 91942(619) 461-3717(619) 461-5663 Get Directions Write a Review

NPPES record last updated: September 2, 2010. Verified against the NPPES registry weekly; last sync: November 01, 2026.

About Mark Shaffer M.d. NPPES

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

MARK SHAFFER M.D. (NPI 1255436804) is an individual internal medicine provider in La Mesa, California, licensed in California (C42649) and active in the NPI registry since September 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1255436804
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameMARK SHAFFERCredential: M.D.
Location Address7877 PARKWAY DR, SUITE1BLa Mesa, CA 91942-2000
Mailing Address7877 Parkway Dr, Suite1bLa Mesa, CA 91942-2000 · (619) 461-3717 · Fax (619) 461-5663
Phone(619) 461-3717
Fax(619) 461-5663
Sole ProprietorYes
Enumeration DateSeptember 14, 2006
Last NPPES UpdateSeptember 2, 2010
✔ NPI 1255436804 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · C42649
Definition
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
7877 PARKWAY DR, La Mesa, CA 91942
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Other Identifiers 2

Medicare UPINE42370
Medicare ID-Type UnspecifiedC42649

Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

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

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 Reassignment

Medicare enrollment records show Mark Shaffer reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Centro De Salud De La Comunidad De San Ysidro, Inc.
3.1 mi
Federally Qualified Health Center (FQHC)
875 EL CAJON BLVD
El Cajon, CA 92020
  • Reassigned Medicare billing, California enrollment
  • 577 clinicians in this Medicare group
NPI 1568845741 (619) 662-4100

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 91942 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
$140.22 typical visit price
range $62.10 – $184.71
Typical copayment $35.05 (range $15.52 – $46.17)
Most-billed visit code 99204
Established Patient
$108.42 typical visit price
range $20.62 – $151.42
Typical copayment $27.10 (range $5.15 – $37.85)
Most-billed visit code 99214
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 10

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

GLENN COOK MD
Ophthalmology
7877 PARKWAY DR, SUITE 100
LA MESA, CA 91942
San Diego County (619) 460-3711
INDEPENDENT DIAGNOSTIC TESTING INC
Portable X-ray and/or Other Portable Diagnostic Imaging Supplier
7877 PARKWAY DR
LA MESA, CA 91942
San Diego County (619) 461-0039
MARTIN M NOSAN MD
Internal Medicine
7877 PARKWAY DR, SUITE 1B
LA MESA, CA 91942
San Diego County (619) 461-3717
WILLIAM BURTON DAVIS M.D.
Internal Medicine (Cardiovascular Disease)
7877 PARKWAY DR, SUITE 1B
LA MESA, CA 91942
San Diego County (619) 461-3717
PAUL L TREGER MD A MEDICAL CORPORATION
Ophthalmology
7877 PARKWAY DR, STE 100
LA MESA, CA 91942
San Diego County (619) 460-9077
PAUL LESLIE TREGER MD
Ophthalmology
7877 PARKWAY DR, SUITE 100
LA MESA, CA 91942
San Diego County (619) 460-9077
MOBILE PHYSICIAN SERVICES
Clinical Medical Laboratory
7877 PARKWAY DR, SUITE 1B
LA MESA, CA 91942
San Diego County (619) 461-3717
DR. ANTHONY TRONG TRAN D.D.S.
Dentist (General Practice)
7877 PARKWAY DR, SUITE 2B
LA MESA, CA 91942
San Diego County (619) 463-6758

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 Shaffer's NPI number?

The NPI number for Mark Shaffer is 1255436804. It was assigned to this individual provider in the NPPES registry on September 14, 2006.

Where is Mark Shaffer located?

Mark Shaffer practices at 7877 Parkway Dr Suite1b, La Mesa, CA 91942. The listed phone number is (619) 461-3717.

What is Mark Shaffer's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Mark Shaffer enrolled in Medicare?

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

Which organization bills Medicare for Mark Shaffer's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Mark Shaffer reassigns Medicare benefits to Centro De Salud De La Comunidad De San Ysidro, Inc. (El Cajon, CA). The 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 Shaffer'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 Shaffer was last updated on September 2, 2010. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 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.