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Internal Medicine Providers in Santa Maria, CA

Browse 24 Internal Medicine providers listed in NPPES with a practice address in Santa Maria, California.

24 Healthcare Providers

How Santa Maria compares with the U.S.

Santa Maria has 22 clinicians in Internal Medicine per 100,000 residents, about 49% of the U.S. rate of 44.

That is 24 active clinicians in Internal Medicine with a practice address in Santa Maria, for a population of 110,462.

The California rate is 45 per 100,000 residents.

What these numbers mean

Clinicians per 100,000 residents compares places of different sizes. We count active clinicians who list a practice address in the area in the federal NPI registry (NPPES) and divide by the number of people who live there, according to the U.S. Census Bureau. The U.S. rate is the same calculation for the whole country.

A higher number does not mean it is easier to get an appointment, that wait times are shorter, or that care is better. It also does not show how many clinicians are accepting new patients or which insurance plans they take. A lower number does not by itself mean there is a shortage.

City counts use the city name in each clinician's practice address. That postal city can cover a larger or smaller area than the city limits the Census Bureau uses for population, and many clinicians list only one address even if they work in several places.

100% of clinicians in Internal Medicine in Santa Maria listed in the CMS Medicare file (15 of 15) accept Medicare assignment. That is similar to the California share of 96%.

What is Medicare assignment?

A clinician who accepts Medicare assignment agrees to take the Medicare-approved amount as full payment for services that Original Medicare covers. You usually still pay your deductible and coinsurance. This comes from the CMS Doctors and Clinicians file and applies to Original Medicare only. Medicare Advantage plans have their own provider networks. It does not show whether a clinician is taking new patients.

Some clinicians are listed as "may accept assignment," which means they can decide case by case. Clinicians without an assignment flag, or who are not in the CMS file, are not counted as accepting assignment. That does not mean they refuse Medicare. Ask the office before your visit.

None of the 15 clinicians in Internal Medicine in Santa Maria listed in the CMS Medicare file have a CMS telehealth indicator. Some may still offer telehealth; ask the office.

About the telehealth indicator

The telehealth indicator comes from CMS. It marks clinicians whose recent paid Medicare claims include services delivered by telehealth. It means a clinician has provided some services by telehealth, not that every visit can be done online. A clinician without the indicator may still offer telehealth, for example to patients who are not on Medicare. Ask the office which visits can be done by video or phone.

These figures summarize public federal data. They do not measure quality of care, appointment availability, or whether a clinician accepts your insurance or new patients. Registry addresses can be out of date. Please confirm details directly with the office and your plan. This information is not medical advice.

Prepared by T-MedInfo from NPPES, CMS and U.S. Census Bureau data. Questions or corrections: support@true-medinfo.com ยท Methodology

Sources: Clinician counts and practice addresses: NPPES NPI Registry, Centers for Medicare & Medicaid Services (CMS), data as of August 2026. Medicare assignment and telehealth indicators: CMS Doctors and Clinicians National Downloadable File. Population: U.S. Census Bureau, American Community Survey 2020-2024 5-Year Estimates, Table B01003 (Total Population).

Internal Medicine Medicare (PECOS) Enrollment & Ordering Eligibility

Medicare enrollment and order/referring eligibility listed by CMS for Internal Medicine practitioners in Santa Maria, CA

Source: CMS PECOS
PECOS Enrolled Specialists 19 In Santa Maria, CA
Part B Lab & Imaging Eligible 19 Diagnostic Referrals
DME Ordering Eligible 19 Durable Medical Equipment
Home Health Agency Referrals 19 HHA Ordering Eligible
Showing 1โ€“20 of 24 providers
With recent CMS data first, then Aโ€“Z

Dr. Elena Yurevna Agafonova , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
1400 E Church St, Santa Maria, CA 934545906
Phone: 8057393000
NPI Identifier 1558757666
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Dr. Mohammad Amjad Arain , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
1505 Shepard Dr, Suite 131, Santa Maria, CA 934547020
Phone: 8059282645
NPI Identifier 1639167158
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Dr. Jimmy Mack Baker , MD

Internal Medicine

Active NPI Status
2801 Santa Maria Way, Santa Maria, CA 934552118
Phone: 8059345400
NPI Identifier 1912054487
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Dr. Nicandro Gerardo Castaneda , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
1400 E Church St, Santa Maria, CA 934545906
Phone: 8057393215
NPI Identifier 1578595245
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Dr. Yosef Diab , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
1400 E Church St, Santa Maria, CA 934545906
Phone: 8054753640
NPI Identifier 1053948026
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Dr. Victor Manuel Guerrero , MD

Internal Medicine

Active NPI Status
430 S Blosser Rd, Santa Maria, CA 934584908
Phone: 8053618900
NPI Identifier 1972596963
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Dr. Hugh Hatfield , MD

Internal Medicine

Active NPI Status
1300 E Cypress St, Ste C2, Santa Maria, CA 934544734
Phone: 8059280217
NPI Identifier 1356360218
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Dr. Albert W Hawkins , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
1300 E Cypress St, G1, Santa Maria, CA 934544728
Phone: 8059280997
NPI Identifier 1588664478
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Dr. Siri Atma Singh Khalsa , MD

Internal Medicine

Active NPI Status
1400 E Church St, Santa Maria, CA 93454
Phone: 8057393215
NPI Identifier 1073701785
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Dr. Ahmad K Nooristani , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
830 E Chapel St, Santa Maria, CA 934544699
Phone: 8059226657
NPI Identifier 1659537306
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Dr. Elham Novin Baheran , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
1400 E Church St, Santa Maria, CA 934545906
Phone: 8057393235
NPI Identifier 1245432897
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Dr. Ijeoma A Ofiaeli , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
117 W Bunny Ave, Santa Maria, CA 934582805
Phone: 8057393890
NPI Identifier 1932138179
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Dr. Rashiklal Patel , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
5075 S Bradley Rd Ste 131, Santa Maria, CA 934555077
Phone: 8053328155
NPI Identifier 1356331185
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Dr. David Kenneth Trefflich , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
430 S Blosser Rd, Santa Maria, CA 934584908
Phone: 8053618900
NPI Identifier 1861836942
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Dr. Lerzan Tunali Madenci , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
1400 East Church Street, Santa Maria, CA 934545906
Phone: 8058786134
NPI Identifier 1659504181
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Dr. Roman Winter , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
1400 E. Church St., Santa Maria, CA 934545906
Phone: 8057393000
NPI Identifier 1588979371
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Dr. Jose Jumil Yongco , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
2115 Centerpointe Pkwy, Santa Maria, CA 934551334
Phone: 8053467230
NPI Identifier 1114941218
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Dr. Joseph Stephen Yorke , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
117 W Bunny Ave, Santa Maria, CA 934582805
Phone: 8057393890
NPI Identifier 1811929516
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Dr. Susan Ziemba , MD

Internal Medicine

Active NPI Status
1510 East Main Street, Suite 104c, Santa Maria, CA 934544825
Phone: 8053498514
NPI Identifier 1427065978
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Dr. Sam Densen , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
2801 Santa Maria Way, Santa Maria, CA 934552118
Phone: 8059345400
NPI Identifier 1881172666
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Frequently Asked Questions about Internal Medicine in Santa Maria

How do I check a Internal Medicine practitioner's license?

Each practitioner profile shows the NUCC taxonomy code and any state license number the practitioner reported to NPPES, plus a link to the California licensing board lookup. NPPES entries are self-reported; current license status is published only by the state board.

Why is a practitioner missing from this list?

This list shows NPI records that are active in NPPES. A deactivated NPI keeps its profile with the deactivation date and practice history; find it with the site search by name or NPI number.