Independent US Healthcare Provider Directory & Public Medical Database Patient Guides
Medical Specialty Listing

Internal Medicine Providers in Tigard, OR

Browse 25 Internal Medicine providers listed in NPPES with a practice address in Tigard, Oregon.

25 Healthcare Providers

How Tigard compares with the U.S.

Tigard has 45 clinicians in Internal Medicine per 100,000 residents, close to the U.S. rate of 44.

That is 25 active clinicians in Internal Medicine with a practice address in Tigard, for a population of 56,011.

The Oregon rate is 50 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 Tigard listed in the CMS Medicare file (12 of 12) accept Medicare assignment. That is similar to the Oregon share of 98%.

Only 12 of 25 active clinicians in Internal Medicine in Tigard appear in the CMS Medicare file, so this share describes that smaller group.

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.

67% of clinicians in Internal Medicine in Tigard listed in the CMS Medicare file (8 of 12) have a CMS telehealth indicator, meaning their recent Medicare claims include telehealth services. That is higher than the Oregon share of 33%.

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 Β· 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 Tigard, OR

Source: CMS PECOS
PECOS Enrolled Specialists 15 In Tigard, OR
Part B Lab & Imaging Eligible 16 Diagnostic Referrals
DME Ordering Eligible 18 Durable Medical Equipment
Home Health Agency Referrals 16 HHA Ordering Eligible
Showing 1–20 of 25 providers
With recent CMS data first, then A–Z

Dr. Evagelia Baros , DO

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
12442 Sw Scholls Ferry Rd, Suite 106, Tigard, OR 972233396
Phone: 5032169200
NPI Identifier 1003019340
View Full Profile

Dr. Christopher Alan Calawa , MD

Internal Medicine

Active NPI Status
18040 Sw Lower Boones Ferry Rd, Ste 100, Tigard, OR 972247258
Phone: 5032160700
NPI Identifier 1992803944
View Full Profile

Dr. Adama Diarra , DO

Internal Medicine

Active NPI Status
7001 Sw Hampton Street, Tigard, OR 97223
Phone: 5036641207
NPI Identifier 1306103338
View Full Profile

Dr. Samuel J Fellin , DO

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
12442 Sw Scholls Ferry Rd, Suite 106, Tigard, OR 972233396
Phone: 5032169200
NPI Identifier 1265463996
View Full Profile

Dr. Enrique Gomez Morayta , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
9250 Sw Hall Blvd, Tigard, OR 972236721
Phone: 5032930161
NPI Identifier 1548417405
View Full Profile

Dr. Heidi M Hagman , MD

Internal Medicine

Active NPI Status
7150 Sw Hampton St Ste 101a, Tigard, OR 972238365
Phone: 9712364445
NPI Identifier 1962489575
View Full Profile

Jennifer Keiser

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
12123 Sw 69th Ave, Tigard, OR 972238514
Phone: 9717087600
NPI Identifier 1144684465
View Full Profile

Dr. Aileen Kim , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
12442 Sw Scholls Ferry Rd, Suite 106, Tigard, OR 972233396
Phone: 5032169200
NPI Identifier 1255360657
View Full Profile

Dr. Daniel Keith Mangum , DO

Internal Medicine

Active NPI Status
9900 Sw Hall Blvd, #200, Tigard, OR 97223
Phone: 5032931515
NPI Identifier 1710055322
View Full Profile

Dr. Kenneth Lyle Martin , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
15298 Sw Royalty Pkwy, Tigard, OR 972243904
Phone: 5036200721
NPI Identifier 1902875016
View Full Profile

Dr. Steven Paul Mcnally , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment
12442 Sw Scholls Ferry Rd, Suite 100, Tigard, OR 972233396
Phone: 5032159900
NPI Identifier 1376635532
View Full Profile

Dr. Poombavai O Nagappan , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
12442 Sw Scholls Ferry Rd, Suite 106, Tigard, OR 972233396
Phone: 5032169200
NPI Identifier 1043246689
View Full Profile

Dr. Ranjana S Nathan , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
12442 Sw Scholls Ferry Rd, Suite 106, Tigard, OR 972233396
Phone: 5032169200
NPI Identifier 1588690127
View Full Profile

Dr. Thuy-Tien Vo Pham , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
12442 Sw Scholls Ferry Rd, Suite 100, Tigard, OR 972233396
Phone: 5032169200
NPI Identifier 1841551041
View Full Profile

Dr. Bryan Schwartz , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
12540 Sw Main St Ste 202, Tigard, OR 972236198
Phone: 5039069995
NPI Identifier 1396060331
View Full Profile

Dr. Lesley K Segal , MD

Internal Medicine

Active NPI Status
12442 Sw Scholls Ferry Rd, Suite 100, Tigard, OR 972233396
Phone: 5032169900
NPI Identifier 1518982941
View Full Profile

Dr. Mary Thomason , MD

Internal Medicine

Active NPI Status Accepts Medicare Assignment Telehealth Services Available
12442 Sw Scholls Ferry Rd, Suite 106, Tigard, OR 972233396
Phone: 5032169200
NPI Identifier 1427019322
View Full Profile

Dr. Milton Louis Blettel , MD

Internal Medicine

Active NPI Status
9900 Sw Hall Blvd, #200, Tigard, OR 97223
Phone: 5032931515
NPI Identifier 1336208388
View Full Profile

Dr. Brian Patrick Burke , MD

Internal Medicine

Active NPI Status
9370 Sw Greenburg Rd, Franklin Bldg, Ste 101, Tigard, OR 972235442
Phone: 5033477366
NPI Identifier 1790822625
View Full Profile

Dr. Joseph Corby Chiovaro , MD

Internal Medicine

Active NPI Status
18081 Sw Lower Boones Ferry Rd Ste 2, Tigard, OR 972247290
Phone: 5036733893
NPI Identifier 1669647830
View Full Profile

Frequently Asked Questions about Internal Medicine in Tigard

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 Oregon 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.