1. Home
  2. Directory
  3. Oregon
  4. Portland
  5. Internal Medicine
  6. NPI Profile

DR. DOUGLAS A SHUMAKER MD
NPI 1225034937
Internal Medicine - Gastroenterology in Portland, OR

Active since June 27, 2005PECOS EnrolledAccepts Medicare Assignment
9701 SW BARNES RD, STE 300, PORTLAND, OR 97225(503) 297-8081(503) 292-6601 Get Directions Write a Review

NPPES record last updated: December 4, 2025. Verified against the NPPES registry weekly; last sync: July 26, 2026.

Record update history: Dec 4, 2025, Dec 1, 2021 (2 updates tracked since 2021).

About Dr. Douglas A Shumaker Md NPPES

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

DR. DOUGLAS A SHUMAKER MD (NPI 1225034937) is an individual gastroenterology provider in Portland, Oregon, licensed in Oregon (MD19573) and active in the NPI registry since June 2005. He is enrolled in Medicare PECOS and is a graduate of Oregon Health Sciences University School Of Medicine (1994).

NPPES Registry Identity

NPI1225034937
Entity TypeIndividualMale
Primary Taxonomy207RG0100X
Provider Legal NameDR. DOUGLAS A SHUMAKERCredential: MD
Location Address9701 SW BARNES RD, STE 300Portland, OR 97225-6689
Mailing Address541 Ne 20th Ave Ste 225Portland, OR 97232-2895 · (503) 963-2801 · Fax (503) 963-2825
Phone(503) 297-8081
Fax(503) 292-6601
Sole ProprietorNo
Medical School CMSOregon Health Sciences University School Of MedicineGraduated 1994
Enumeration DateJune 27, 2005
Last NPPES UpdateDecember 4, 20252 updates tracked since enumeration
NPPES CertifiedDecember 4, 2025
✔ NPI 1225034937 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyInternal Medicine · GastroenterologyAllopathic & Osteopathic Physicians
Taxonomy Code207RG0100X
License✔ Licensed in OR · MD19573
Definition

An internist who specializes in diagnosis and treatment of diseases of the digestive organs including the stomach, bowels, liver and gallbladder. This specialist treats conditions such as abdominal pain, ulcers, diarrhea, cancer and jaundice and performs complex diagnostic and therapeutic procedures using endoscopes to visualize internal organs.

Also ListedAllergy & Immunology · AllergyTaxonomy 207KA0200X · License MD19573 (OR)
9701 SW BARNES RD, Portland, OR 97225
Open in Google Maps ↗

Other Identifiers 2

Medicaid287462OR
Medicaid8502510WA

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Douglas A Shumaker Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID5193782126
PECOS Enrollment IDI20080305000567
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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 97225 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
$134.16 typical visit price
range $58.99 – $176.88
Typical copayment $33.54 (range $14.74 – $44.22)
Most-billed visit code 99204
Established Patient
$103.51 typical visit price
range $19.32 – $144.79
Typical copayment $25.87 (range $4.83 – $36.19)
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 4

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

Parenteral nutrition solution, not otherwise specified, 10 grams lipids B4185
Other-Enteral and Parenteral · category OB005N
1 supplier16 claims162 services$11.26 avg. paid by Medicare
Parenteral nutrition solution; compounded amino acid and carbohydrates with electrolytes, trace elements, and vitamins, including preparation, any strength, 10 to 51 grams of protein - premix B4189
Other-Enteral and Parenteral · category OB005N
1 supplier36 claims118 services$176.04 avg. paid by Medicare
Parenteral nutrition supply kit; premix, per day B4220
Other-Enteral and Parenteral · category OB005N
1 supplier36 claims119 services$8.00 avg. paid by Medicare
Parenteral nutrition administration kit, per day B4224
Other-Enteral and Parenteral · category OB005N
1 supplier36 claims119 services$24.97 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.

DR. CHRISTOPHER R CARTER MD
Internal Medicine (Gastroenterology)
9701 SW BARNES RD, SUITE 300
PORTLAND, OR 97225
Washington County (503) 297-8081
THE OREGON CLINIC PC
Clinic/Center (Endoscopy)
9701 SW BARNES RD, SUITE 310
PORTLAND, OR 97225
Washington County (503) 297-8081
DR. CRISTIAN R. VALLEJOS M.D.
Internal Medicine (Gastroenterology)
9701 SW BARNES RD, SUITE 300
PORTLAND, OR 97225
Washington County (503) 297-8081
SALLY J WENTROSS MD
Obstetrics & Gynecology
9701 SW BARNES RD, SUITE 200
PORTLAND, OR 97225
Washington County (503) 734-3700
DR. GEORGE KOVAL MD
Internal Medicine (Gastroenterology)
9701 SW BARNES RD, STE 300
PORTLAND, OR 97225
Washington County (503) 297-8081
JENNIFER SARA SEMMELROTH PA-C
Physician Assistant (Medical)
9701 SW BARNES RD, SUITE 300
PORTLAND, OR 97225
Washington County (503) 297-8081
ANNA MALORA HARTSHORN ACNP
Nurse Practitioner (Acute Care)
9701 SW BARNES RD, SUITE 300
PORTLAND, OR 97225
Washington County (503) 297-8081
DR. MARY ELIZABETH SKRYPZAK M.D.
Obstetrics & Gynecology (Gynecology)
9701 SW BARNES RD, SUITE 150
PORTLAND, OR 97225
Washington County (503) 734-3535

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 Douglas Shumaker's NPI number?

The NPI number for Douglas Shumaker is 1225034937. It was assigned to this individual provider in the NPPES registry on June 27, 2005.

Where is Douglas Shumaker located?

Douglas Shumaker practices at 9701 SW Barnes Rd Ste 300, Portland, OR 97225. The listed phone number is (503) 297-8081.

What is Douglas Shumaker's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.

Is Douglas Shumaker enrolled in Medicare?

Yes. Douglas Shumaker is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

When was this NPI record last updated?

The NPPES record for Douglas Shumaker was last updated on December 4, 2025. NPI Profile syncs with the weekly NPPES data releases published by CMS.