DR. BENJAMIN F MERRIFIELD MD
NPI 1083695167
Internal Medicine - Gastroenterology in Olympia, WA
About Dr. Benjamin F Merrifield Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
DR. BENJAMIN F MERRIFIELD MD (NPI 1083695167) is an individual gastroenterology provider in Olympia, Washington, licensed in Washington (MD00044510) and active in the NPI registry since November 2005. He is enrolled in Medicare PECOS, is affiliated with Providence St Peter Hospital, and maintains a secondary practice location in Olympia.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Other Identifiers 1
Accepted Insurance
Medicare Participation & PECOS CMS
Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.
Medicare Enrollment Status
Enrolled in Medicare and accepts Medicare assignment
Dr. Benjamin F Merrifield 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.
Medicare Billing Reassignments
2Medicare enrollment records show Benjamin Merrifield reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Olympia, WA 98506
- Reassigned Medicare billing, Washington enrollment
- 59 clinicians in this Medicare group
Olympia, WA 98506
- Reassigned Medicare billing, Washington enrollment
- 83 clinicians in this Medicare group
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 7
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.
Hospital Affiliations CMS Care Compare
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Providence St Peter Hospital
Acute Care Hospitals · Olympia, WAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 98506 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
OLYMPIA, WA 98506
OLYMPIA, WA 98506
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 Benjamin Merrifield's NPI number?
The NPI number for Benjamin Merrifield is 1083695167. It was assigned to this individual provider in the NPPES registry on November 7, 2005.
Where is Benjamin Merrifield located?
Benjamin Merrifield practices at 209 Lilly Rd NE, Olympia, WA 98506. The listed phone number is (360) 413-8250.
What is Benjamin Merrifield's specialty?
The primary specialty registered for this NPI is Internal Medicine, specializing in Gastroenterology, with taxonomy code 207RG0100X.
Is Benjamin Merrifield enrolled in Medicare?
Yes. Benjamin Merrifield 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.
Which organizations bill Medicare for Benjamin Merrifield's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Benjamin Merrifield reassigns Medicare benefits to 2 organizations: Gastroenterology Associates Clinical Practice, PLLC (Olympia, WA) and Puget Sound Gastroenterology, PLLC (Olympia, WA). 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 Benjamin Merrifield's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Benjamin Merrifield accept?
Health plans from Providence Health Plan list Benjamin Merrifield as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.
Is Benjamin Merrifield affiliated with any hospitals?
According to CMS data, Benjamin Merrifield is affiliated with Providence St Peter Hospital.
When was this NPI record last updated?
The NPPES record for Benjamin Merrifield was last updated on March 7, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Dr. Benjamin F Merrifield, MD · NPI 1083695167
Gastroenterology physician in Olympia, Washington. Individual provider, active in the CMS NPPES registry since November 7, 2005.
## Identity
- **NPI:** 1083695167 (Entity type: Individual)
- **Enumerated:** November 7, 2005
- **Primary specialty:** Internal Medicine - Gastroenterology · taxonomy 207RG0100X
- **State license:** MD00044510 (Washington)
- **Sole proprietor:** No
## Practice location
- **Address:** 209 LILLY RD NE, Olympia, WA 98506
- **Phone:** (360) 413-8250 · **Fax:** (360) 413-8830
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Gastroenterology Associates Clinical Practice, PLLC (NPI 1811556442, Olympia, WA); Puget Sound Gastroenterology, PLLC (NPI 1386340164, Olympia, WA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** Clvlnd Clinic Lerner College Of Med Of Case Wstn Rsv University, class of 1998
## Record status
- **NPPES last updated:** March 7, 2023
- **Other identifiers:** Other MD00044510 (WA)
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Source: [NPI Profile](https://npiprofile.com/npi/1083695167) · Data from the CMS NPPES public registry.