1. Home
  2. Directory
  3. Washington
  4. Dayton
  5. Family Medicine
  6. NPI Profile

DR. GARY THOMAS UNDERHILL MD
NPI 1851375265
Family Medicine in Dayton, WA

Active since November 30, 2005PECOS EnrolledAccepts Medicare Assignment
91.52/100
CMS Quality Rating
1012 S 3RD ST, DAYTON, WA 99328(509) 382-2531(509) 382-3205 Get Directions Write a Review

NPPES record last updated: March 3, 2025. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Record update history: Mar 3, 2025, Mar 30, 2017, Nov 8, 2016 (3 updates tracked since 2016).

About Dr. Gary Thomas Underhill Md NPPES

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

DR. GARY THOMAS UNDERHILL MD (NPI 1851375265) is an individual family medicine provider in Dayton, Washington, licensed in Washington (MD00037711) and active in the NPI registry since November 2005. He is enrolled in Medicare PECOS, is affiliated with Trios Health, and is a graduate of Loma Linda University School Of Medicine (1996).

NPPES Registry Identity

NPI1851375265
Entity TypeIndividualMale
Primary Taxonomy207Q00000X
Provider Legal NameDR. GARY THOMAS UNDERHILLCredential: MD
Location Address1012 S 3RD STDayton, WA 99328
Mailing Address1012 S 3rd StDayton, WA 99328 · (509) 382-2531 · Fax (509) 382-3205
Phone(509) 382-2531
Fax(509) 382-3205
Sole ProprietorNo
Medical School CMSLoma Linda University School Of MedicineGraduated 1996
Enumeration DateNovember 30, 2005
Last NPPES UpdateMarch 3, 20253 updates tracked since enumeration
✔ NPI 1851375265 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyFamily MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207Q00000X
License✔ Licensed in WA · MD00037711
Definition
Family Medicine is the medical specialty which is concerned with the total health care of the individual and the family. It is the specialty in breadth which integrates the biological, clinical, and behavioral sciences. The scope of family medicine is not limited by age, sex, organ system, or disease entity.
Also ListedEmergency MedicineTaxonomy 207P00000X · License MD00037711 (WA), MD0037711 (WA)
1012 S 3RD ST, Dayton, WA 99328
Open in Google Maps ↗

Other Identifiers 1

Medicaid1020580WA

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include PacificSource Health Plans.Insurance ›

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. Gary Thomas Underhill 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 ID1850483470
PECOS Enrollment IDI20070827000624
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.

Areas of Expertise CMS Part B claims 6

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.

Emergency department visit with high level of medical decision making 99285
An emergency department visit for severe conditions is when you urgently seek medical help due to serious health issues. These could be severe injuries, breathing problems, unbearable pain, or sudden severe illness. Doctors and nurses will provide immediate care to stabilize your condition.
125 services119 patients
Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only 93010
A routine electrocardiogram (ECG) with 12 leads is a simple, non-invasive test that records the electrical activity of your heart. It helps in identifying heart conditions by detecting irregularities in your heart rhythms. The results are interpreted and a report is provided.
108 services102 patients
Emergency department visit with moderate level of medical decision making 99284
An emergency department visit for a high-severity issue means you're experiencing a serious health problem that needs immediate attention. This could be a severe injury, serious illness, or life-threatening condition. Medical professionals will provide urgent care to stabilize your condition.
38 services38 patients
Critical care, first 30-74 minutes 99291
Critical care involves immediate and constant attention by a team of specially-trained health professionals. It's for patients with life-threatening conditions, requiring first 30-74 minutes of intense monitoring and treatment.
26 services26 patients
Subsequent hospital care with straightforward or low level of medical decision making, per day, if using time, at least 25 minutes 99231
Follow-up hospital inpatient care is a daily service where a healthcare professional checks on your health progress during your hospital stay. Each session typically lasts 15 minutes, involving updates on your condition and adjustments to your treatment plan, if necessary.
24 services13 patients
Hospital discharge day management, more than 30 minutes 99239
Hospital discharge day management over 30 minutes involves a detailed process to ensure a smooth transition from hospital to home. It includes final examinations, discussion of your hospital stay, post-discharge instructions, and coordinating follow-up care.
11 services11 patients

Hospital Affiliations CMS Care Compare 2

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

Trios Health

Acute Care Hospitals · Kennewick, WA
1/5 CMS rating
OwnershipGovernment - Hospital District or Authority
CMS Certification Number500053
Location900 South Auburn StreetKennewick, WA 99336 · Benton County
Emergency services Birthing friendly

Dayton General Hospital

Critical Access Hospitals · Dayton, WA
OwnershipGovernment - Hospital District or Authority
CMS Certification Number501302
Location1012 South 3rd StreetDayton, WA 99328 · Columbia County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 99328 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.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

91.52/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality75.37
Improvement Activities40

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.

MICHAEL LUCE M.D.
Family Medicine
1012 S 3RD ST
DAYTON, WA 99328
Columbia County (509) 382-2531
KIM IRENE EMERY PA-C
Physician Assistant
1012 S 3RD ST
DAYTON, WA 99328
Columbia County (509) 382-2531
SHERENA GWENEVERE CLEMENTS RN
Clinical Nurse Specialist (Emergency)
1012 S 3RD ST
DAYTON, WA 99328
Columbia County (509) 382-3218
JENNIFER LEA BURNETT NP
Nurse Practitioner
1012 S 3RD ST
DAYTON, WA 99328
Columbia County (509) 382-2531
DR. YONGMOON ANDREW PARK MD
Specialist
1012 S 3RD ST
DAYTON, WA 99328
Columbia County (509) 382-3200
KENNETH DYBALL PAC
Family Medicine
1012 S 3RD ST
DAYTON, WA 99328
Columbia County (509) 382-2531
LAURENCE A EIDT M.D.
Family Medicine
1012 S 3RD ST
DAYTON, WA 99328
Columbia County (509) 382-2531
MICHELLE JENKINS ARNP
Nurse Practitioner (Family)
1012 S 3RD ST
DAYTON, WA 99328
Columbia County (509) 382-3200

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 Gary Underhill's NPI number?

The NPI number for Gary Underhill is 1851375265. It was assigned to this individual provider in the NPPES registry on November 30, 2005.

Where is Gary Underhill located?

Gary Underhill practices at 1012 S 3rd St, Dayton, WA 99328. The listed phone number is (509) 382-2531.

What is Gary Underhill's specialty?

The primary specialty registered for this NPI is Family Medicine with taxonomy code 207Q00000X.

Is Gary Underhill enrolled in Medicare?

Yes. Gary Underhill 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.

What insurance does Gary Underhill accept?

Health plans from PacificSource Health Plans list Gary Underhill 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 Gary Underhill affiliated with any hospitals?

According to CMS data, Gary Underhill is affiliated with Trios Health and Dayton General Hospital.

When was this NPI record last updated?

The NPPES record for Gary Underhill was last updated on March 3, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 17 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.