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SIAMAK MEHDIZADEHSERAJ M.D.
NPI 1720460942
Internal Medicine in French Camp, CA

Active since June 24, 2015PECOS Enrolled
500 W HOSPITAL RD, FRENCH CAMP, CA 95231(209) 468-6000(209) 468-7042 Get Directions Write a Review

NPPES record last updated: September 5, 2018. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Siamak Mehdizadehseraj M.d. NPPES

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

SIAMAK MEHDIZADEHSERAJ M.D. (NPI 1720460942) is an individual internal medicine provider in French Camp, California, licensed in California (A152630) and active in the NPI registry since June 2015. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1720460942
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameSIAMAK MEHDIZADEHSERAJCredential: M.D.
Location Address500 W HOSPITAL RDFrench Camp, CA 95231
Mailing AddressPo Box 1020Stockton, CA 95201-3120 · (209) 468-6000 · Fax (209) 468-7042
Phone(209) 468-6000
Fax(209) 468-7042
Sole ProprietorNo
Enumeration DateJune 24, 2015
Last NPPES UpdateSeptember 5, 2018
✔ NPI 1720460942 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CA · A152630
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.
Also ListedStudent in an Organized Health Care Education/Training ProgramTaxonomy 390200000X
500 W HOSPITAL RD, French Camp, CA 95231
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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)

Siamak Mehdizadehseraj 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 Reassignments

5

Medicare enrollment records show Siamak Mehdizadehseraj reassigns Medicare billing to 5 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

County Of San Joaquin
Same address
General Acute Care Hospital
500 W. HOSPITAL RD.
French Camp, CA 95231
  • Reassigned Medicare billing, California enrollment
  • 534 clinicians in this Medicare group
NPI 1801830583 (209) 468-6937
San Joaquin Faculty Medical Group
Same address
Internal Medicine
500 HOSPITAL RD
French Camp, CA 95231
  • Reassigned Medicare billing, California enrollment
  • 512 clinicians in this Medicare group
NPI 1225063761 (209) 473-6555
Quality Care Solution Inc.
53 mi
Internal Medicine
545 MORSE AVE
Sunnyvale, CA 94085
  • Reassigned Medicare billing, California enrollment
  • 20 clinicians in this Medicare group
NPI 1356944235 (832) 618-8479
Geriatrics Care Solution Inc
61 mi
Internal Medicine
318 MAIN ST UNIT 5J
San Francisco, CA 94105
  • Reassigned Medicare billing, California enrollment
  • 10 clinicians in this Medicare group
NPI 1477399590 (617) 510-7972
Hospitalist Medicine Physicians Of California, Inc
322 mi
Internal Medicine
18300 US HIGHWAY 18
Apple Valley, CA 92307
  • Reassigned Medicare billing, California enrollment
  • 914 clinicians in this Medicare group
NPI 1184663965 (760) 946-4233

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

Areas of Expertise CMS Part B claims 10

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, 20 minutes or more 99308
A follow-up nursing facility visit per day is a daily check-up service provided by healthcare professionals. It lasts around 15 minutes and involves assessing your health status, monitoring your recovery progress, and addressing any concerns you may have about your health or treatment.
1,354 services305 patients
Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes 99309
A follow-up nursing facility visit per day is a daily check-in by a healthcare professional. This 25-minute visit typically involves monitoring your health progress, addressing any concerns, and adjusting treatment plans as necessary. It's a vital part of ensuring your ongoing wellbeing.
786 services279 patients
Subsequent nursing facility care with straightforward level of medical decision making, per day, if using time, 20 minutes or more 99308
A follow-up nursing facility visit per day is a daily check-up service provided by healthcare professionals. It lasts around 15 minutes and involves assessing your health status, monitoring your recovery progress, and addressing any concerns you may have about your health or treatment.
315 services77 patients
Subsequent nursing facility care with moderate level of medical decision making, per day, if using time, at least 30 minutes 99309
A follow-up nursing facility visit per day is a daily check-in by a healthcare professional. This 25-minute visit typically involves monitoring your health progress, addressing any concerns, and adjusting treatment plans as necessary. It's a vital part of ensuring your ongoing wellbeing.
211 services76 patients
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
198 services60 patients
Initial nursing facility care with high level of medical decision making, per day, if using time, 50 minutes or more 99306
An initial nursing facility visit is your first meeting with your healthcare team at a nursing facility. Lasting typically 45 minutes, this appointment involves a comprehensive health assessment and the creation of your personalized care plan. It's a crucial step to ensure your health and well-being.
77 services68 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 95231 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
$133.94 typical visit price
range $58.87 – $176.60
Typical copayment $33.48 (range $14.71 – $44.15)
Most-billed visit code 99204
Established Patient
$103.36 typical visit price
range $19.28 – $144.60
Typical copayment $25.84 (range $4.82 – $36.15)
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.

Referred Medical Equipment & Supplies CMS DME claims 2

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Portable gaseous oxygen system, rental; includes portable container, regulator, flowmeter, humidifier, cannula or mask, and tubing E0431
DME-Oxygen and Supplies · category DC000N
1 supplier23 claims23 services$9.93 avg. paid by Medicare
Oxygen concentrator, single delivery port, capable of delivering 85 percent or greater oxygen concentration at the prescribed flow rate E1390
DME-Oxygen and Supplies · category DC002N
2 suppliers25 claims25 services$42.27 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 20

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

MARIA MONTANEZ
Counselor (Addiction (Substance Use Disorder))
500 W HOSPITAL RD
FRENCH CAMP, CA 95231
San Joaquin County (209) 468-6208
HIBA ALAM MD
Student in an Organized Health Care Education/Training Program
500 W HOSPITAL RD
FRENCH CAMP, CA 95231
San Joaquin County (209) 468-6032
MR. TOMAS LAJIAS MORALES
Counselor (Addiction (Substance Use Disorder))
500 W HOSPITAL RD
FRENCHCAMP, CA 95231
San Joaquin County (209) 468-6129
ANH H. LE MD
Obstetrics & Gynecology
500 W HOSPITAL RD
FRENCH CAMP, CA 95231
San Joaquin County (209) 468-6820
MICHELLE JEAN ROWE D.O.
Family Medicine (Sports Medicine)
500 W HOSPITAL RD
FRENCH CAMP, CA 95231
San Joaquin County (209) 468-6820
ROBERT LEE LEWIS
Counselor (Addiction (Substance Use Disorder))
500 W HOSPITAL RD
FRENCH CAMP, CA 95231
San Joaquin County (209) 468-6857
NAVPREET SINGH
Student in an Organized Health Care Education/Training Program
500 W HOSPITAL RD
FRENCH CAMP, CA 95231
San Joaquin County (209) 468-6641
DR. PETER C. MEADE M.D.
Surgery
500 W HOSPITAL RD
FRENCH CAMP, CA 95231
San Joaquin County (209) 468-6000

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 Siamak Mehdizadehseraj's NPI number?

The NPI number for Siamak Mehdizadehseraj is 1720460942. It was assigned to this individual provider in the NPPES registry on June 24, 2015.

Where is Siamak Mehdizadehseraj located?

Siamak Mehdizadehseraj practices at 500 W Hospital Rd, French Camp, CA 95231. The listed phone number is (209) 468-6000.

What is Siamak Mehdizadehseraj's specialty?

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

Is Siamak Mehdizadehseraj enrolled in Medicare?

Yes. Siamak Mehdizadehseraj is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Siamak Mehdizadehseraj's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Siamak Mehdizadehseraj reassigns Medicare benefits to 5 organizations: County Of San Joaquin (French Camp, CA), San Joaquin Faculty Medical Group (French Camp, CA), Quality Care Solution Inc. (Sunnyvale, CA), Geriatrics Care Solution Inc (San Francisco, CA) and Hospitalist Medicine Physicians Of California, Inc (Apple Valley, 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 Siamak Mehdizadehseraj'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 Siamak Mehdizadehseraj was last updated on September 5, 2018. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 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.