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DR. SIDNEY P WILLIAMSON JR. MD
NPI 1649368044
Emergency Medicine in Bozeman, MT

Active since October 11, 2006PECOS EnrolledAccepts Medicare Assignment
80.8/100
CMS Quality Rating
915 HIGHLAND BLVD, BOZEMAN, MT 59715(406) 585-5000 Get Directions Write a Review

NPPES record last updated: April 15, 2025. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Dr. Sidney P Williamson Jr. Md NPPES

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

DR. SIDNEY P WILLIAMSON JR. MD (NPI 1649368044) is an individual emergency medicine provider in Bozeman, Montana, licensed in Montana (10418) and active in the NPI registry since October 2006. He is enrolled in Medicare PECOS, is affiliated with Bozeman Health Deaconess Hospital, and is a graduate of Other (1999).

NPPES Registry Identity

NPI1649368044
Entity TypeIndividualMale
Primary Taxonomy207P00000X
Provider Legal NameDR. SIDNEY P WILLIAMSON JR.Credential: MD
Location Address915 HIGHLAND BLVDBozeman, MT 59715-6902
Mailing Address915 Highland BlvdBozeman, MT 59715-6902 · (406) 414-5000
Phone(406) 585-5000
Sole ProprietorNo
Medical School CMSOtherGraduated 1999
Enumeration DateOctober 11, 2006
Last NPPES UpdateApril 15, 2025
NPPES CertifiedApril 15, 2025
✔ NPI 1649368044 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207P00000X
License✔ Licensed in MT · 10418
Definition
An emergency physician focuses on the immediate decision making and action necessary to prevent death or any further disability both in the pre-hospital setting by directing emergency medical technicians and in the emergency department. The emergency physician provides immediate recognition, evaluation, care, stabilization and disposition of a generally diversified population of adult and pediatric patients in response to acute illness and injury.
915 HIGHLAND BLVD, Bozeman, MT 59715
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Other Identifiers 3

OtherP00031418Medicare Railroad
Medicaid3502642MT
Other94845Bcbs Mt

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Cross and Blue Shield of Montana, Mountain Health CO-OP.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. Sidney P Williamson Jr. 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 ID2961530878
PECOS Enrollment IDI20100513001129
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 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.

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.
160 services154 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.
119 services118 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.
33 services31 patients
Emergency department visit with low level of medical decision making 99283
An emergency department visit for a problem of moderate severity involves immediate medical attention for issues like minor fractures, burns, or high fever. The healthcare team will assess your condition, provide necessary treatment, and may suggest further tests or admission if required.
22 services22 patients

Hospital Affiliations CMS Care Compare

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

Bozeman Health Deaconess Hospital

Acute Care Hospitals · Bozeman, MT
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number270057
Location915 Highland Blvd Suite 3310Bozeman, MT 59715 · Gallatin County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 59715 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
$87.97 typical visit price
range $56.81 – $172.26
Typical copayment $21.99 (range $14.20 – $43.06)
Most-billed visit code 99203
Established Patient
$100.16 typical visit price
range $18.24 – $140.32
Typical copayment $25.04 (range $4.56 – $35.08)
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.

80.8/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality88.76
Promoting Interoperability87
Improvement Activities40
Cost58.08

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.

Portable gaseous oxygen system, rental; includes portable container, regulator, flowmeter, humidifier, cannula or mask, and tubing E0431
DME-Oxygen and Supplies · category DC000N
1 supplier11 claims11 services$19.35 avg. paid by Medicare
Oxygen concentrator, single delivery port, capable of delivering 85 percent or greater oxygen concentration at the prescribed flow rate E1390
DME-Oxygen and Supplies · category DC002N
1 supplier17 claims17 services$109.44 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. CHRISTOFFER AARON SPOJA D.O.
Internal Medicine
915 HIGHLAND BLVD
BOZEMAN, MT 59715
Gallatin County (406) 414-5000
DR. TORY BETH KATZ MD
Hospitalist
915 HIGHLAND BLVD
BOZEMAN, MT 59715
Gallatin County (405) 551-5050
BOZEMAN HEALTH DEACONESS HOSPITAL
Durable Medical Equipment & Medical Supplies
915 HIGHLAND BLVD
BOZEMAN, MT 59715
Gallatin County (406) 414-5000
LAINE MICHELLE LOBERG PHARM.D
Pharmacist
915 HIGHLAND BLVD
BOZEMAN, MT 59715
Gallatin County (406) 585-1050
MRS. PAMELA JEAN MARCELLA PTA
Physical Therapy Assistant
915 HIGHLAND BLVD
BOZEMAN, MT 59715
Gallatin County (406) 585-1002
MARY D O'ROURKE MD
Internal Medicine
915 HIGHLAND BLVD
BOZEMAN, MT 59715
Gallatin County (406) 414-5000
ERIC SCRANTON PA-C
Physician Assistant
915 HIGHLAND BLVD
BOZEMAN, MT 59715
Gallatin County (406) 585-5000
DR. R JAMES MAJXNER MD
Emergency Medicine
915 HIGHLAND BLVD
BOZEMAN, MT 59715
Gallatin County (406) 585-5000

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 Sidney Williamson's NPI number?

The NPI number for Sidney Williamson is 1649368044. It was assigned to this individual provider in the NPPES registry on October 11, 2006.

Where is Sidney Williamson located?

Sidney Williamson practices at 915 Highland Blvd, Bozeman, MT 59715. The listed phone number is (406) 585-5000.

What is Sidney Williamson's specialty?

The primary specialty registered for this NPI is Emergency Medicine with taxonomy code 207P00000X.

Is Sidney Williamson enrolled in Medicare?

Yes. Sidney Williamson 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 Sidney Williamson accept?

Health plans from Blue Cross and Blue Shield of Montana and Mountain Health CO-OP list Sidney Williamson 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 Sidney Williamson affiliated with any hospitals?

According to CMS data, Sidney Williamson is affiliated with Bozeman Health Deaconess Hospital.

When was this NPI record last updated?

The NPPES record for Sidney Williamson was last updated on April 15, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 16 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.