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MS. TERRA J GRANDMASON ARNP
NPI 1235328501
Nurse Practitioner - Family in Olympia, WA

Active since October 23, 2007PECOS EnrolledAccepts Medicare Assignment
209 LILLY RD NE # B, OLYMPIA, WA 98506(360) 413-8250(360) 413-8830 Get Directions Write a Review

NPPES record last updated: May 28, 2026. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: May 28, 2026, May 25, 2021, Oct 9, 2018 (3 updates tracked since 2018).

About Ms. Terra J Grandmason Arnp NPPES

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

MS. TERRA J GRANDMASON ARNP (NPI 1235328501) is an individual family provider in Olympia, Washington, licensed in Washington (AP30007907) and active in the NPI registry since October 2007. She is enrolled in Medicare PECOS, is affiliated with Providence Centralia Hospital, and maintains a secondary practice location in Olympia.

NPPES Registry Identity

NPI1235328501
Entity TypeIndividualFemale
Primary Taxonomy363LF0000X
Provider Legal NameMS. TERRA J GRANDMASONCredential: ARNP
Location Address209 LILLY RD NE # BOlympia, WA 98506-5030
Mailing Address209 Lilly Rd Ne # BOlympia, WA 98506-5030 · (360) 413-8250 · Fax (360) 413-8830
Phone(360) 413-8250
Fax(360) 413-8830
Sole ProprietorNo
Medical School CMSOtherGraduated 2007
Enumeration DateOctober 23, 2007
Last NPPES UpdateMay 28, 20263 updates tracked since enumeration
NPPES CertifiedMay 28, 2026
✔ NPI 1235328501 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyNurse Practitioner · FamilyPhysician Assistants & Advanced Practice Nursing Providers
Taxonomy Code363LF0000X
License✔ Licensed in WA · AP30007907
209 LILLY RD NE # B, Olympia, WA 98506
Open in Google Maps ↗

Secondary Practice Location 1

Location 1222 Kenyon St NW Ste 1Olympia, WA 98502-4578 · Phone (253) 234-7027 · Fax (800) 476-0457

Other Identifiers 1

Medicaid1054720WA

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include PacificSource Health Plans, Premera Blue Cross Blue Shield of Alaska, Providence Health Plan.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

Ms. Terra J Grandmason Arnp 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 ID2860574514
PECOS Enrollment IDI20080204000045
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

6

Medicare enrollment records show Terra Grandmason reassigns Medicare billing to 6 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Puget Sound Gastroenterology, PLLC
Same address
Gastroenterology
209 LILLY RD NE STE B
Olympia, WA 98506
  • Reassigned Medicare billing, Washington enrollment
  • 83 clinicians in this Medicare group
NPI 1386340164 (360) 413-8250
Lewis County Community Health Services
0.1 mi
Federally Qualified Health Center (FQHC)
3444 MARTIN WAY E RM 4
Olympia, WA 98506
  • Reassigned Medicare billing, Washington enrollment
  • 68 clinicians in this Medicare group
NPI 1205309937 (360) 338-6129
Providence Health & Services Washington
0.3 mi
Family Medicine
525 LILLY RD NE
Olympia, WA 98506
  • Reassigned Medicare billing, Washington enrollment
  • 646 clinicians in this Medicare group
NPI 1174744304 (360) 793-7230
Grays Harbor County Public Hospital District No. 1
20 mi
Rural Health
105 W SIMPSON AVE
Mccleary, WA 98557
  • Reassigned Medicare billing, Washington enrollment
  • 138 clinicians in this Medicare group
NPI 1255401683 (360) 346-2222
Signify Health, LLC
1,676 mi
General Practice
4055 VALLEY VIEW LN STE 700
Dallas, TX 75244
  • Reassigned Medicare billing, Alaska, Arizona and Utah enrollments
  • 19 clinicians in this Medicare group
NPI 1689158487 (469) 466-7007
Signify Health Medical Associates, PLLC
1,676 mi
General Practice
4055 VALLEY VIEW LN STE 700
Dallas, TX 75244
  • Reassigned Medicare billing, Washington enrollment
  • 317 clinicians in this Medicare group
NPI 1750845863 (972) 715-3800

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 4

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.

New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204
This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.
152 services152 patients
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
130 services91 patients
New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203
This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.
58 services58 patients
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
53 services49 patients

Hospital Affiliations CMS Care Compare 4

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Providence Centralia Hospital

Acute Care Hospitals · Centralia, WA
3/5 CMS rating
OwnershipVoluntary non-profit - Other
CMS Certification Number500019
Location914 S Scheuber RoadCentralia, WA 98531 · Lewis County
Emergency services Birthing friendly

Providence St Peter Hospital

Acute Care Hospitals · Olympia, WA
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number500024
Location413 Lilly Road NEOlympia, WA 98506 · Thurston County
Emergency services Birthing friendly

Tacoma General Allenmore Hospital

Acute Care Hospitals · Tacoma, WA
2/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number500129
Location315 S Mlk Jr WayTacoma, WA 98405 · Pierce County
Emergency services Birthing friendly

Mason General Hospital & Family Of Clinics

Critical Access Hospitals · Shelton, WA
1/5 CMS rating
OwnershipGovernment - Hospital District or Authority
CMS Certification Number501336
Location901 Mt View DriveShelton, WA 98584 · Mason County
Emergency services

Physician 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.

New Patient
$88.29 typical visit price
range $57.27 – $172.80
Typical copayment $22.07 (range $14.31 – $43.20)
Most-billed visit code 99203
Established Patient
$100.78 typical visit price
range $18.56 – $141.11
Typical copayment $25.19 (range $4.64 – $35.27)
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.

Nebulizer, with compressor E0570
DME-Other DME · category DE000N
1 supplier29 claims30 services$7.00 avg. paid by Medicare
Supply allowance for therapeutic continuous glucose monitor (cgm), includes all supplies and accessories, 1 month supply = 1 unit of service K0553
DME-Other DME · category DE017N
3 suppliers18 claims18 services$195.87 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

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 Terra Grandmason's NPI number?

The NPI number for Terra Grandmason is 1235328501. It was assigned to this individual provider in the NPPES registry on October 23, 2007.

Where is Terra Grandmason located?

Terra Grandmason practices at 209 Lilly Rd NE # B, Olympia, WA 98506. The listed phone number is (360) 413-8250.

What is Terra Grandmason's specialty?

The primary specialty registered for this NPI is Nurse Practitioner, specializing in Family, with taxonomy code 363LF0000X.

Is Terra Grandmason enrolled in Medicare?

Yes. Terra Grandmason 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 Terra Grandmason's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Terra Grandmason reassigns Medicare benefits to 6 organizations: Puget Sound Gastroenterology, PLLC (Olympia, WA), Lewis County Community Health Services (Olympia, WA), Providence Health & Services Washington (Olympia, WA), Grays Harbor County Public Hospital District No. 1 (Mccleary, WA), Signify Health, LLC (Dallas, TX) and 1 more organization, listed in the Medicare section above. 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 Terra Grandmason's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Terra Grandmason accept?

Health plans from PacificSource Health Plans, Premera Blue Cross Blue Shield of Alaska and Providence Health Plan list Terra Grandmason 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 Terra Grandmason affiliated with any hospitals?

According to CMS data, Terra Grandmason is affiliated with Providence Centralia Hospital, Providence St Peter Hospital, Tacoma General Allenmore Hospital and Mason General Hospital & Family Of Clinics.

When was this NPI record last updated?

The NPPES record for Terra Grandmason was last updated on May 28, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 months 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.