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DR. WILLIAM B GREGORY MD
NPI 1659337350
Emergency Medicine in Pasadena, CA

Active since April 22, 2006PECOS EnrolledAccepts Medicare Assignment
100 W CALIFORNIA BLVD, PASADENA, CA 91105(626) 397-3445(626) 397-5643 Get Directions Write a Review

NPPES record last updated: June 13, 2008. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Dr. William B Gregory Md NPPES

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

DR. WILLIAM B GREGORY MD (NPI 1659337350) is an individual emergency medicine provider in Pasadena, California, licensed in California (A78714) and active in the NPI registry since April 2006. He is enrolled in Medicare PECOS, is affiliated with Northern Nevada Medical Center, and is a graduate of Medical University Of South Carolina College Of Medicine (1999).

NPPES Registry Identity

NPI1659337350
Entity TypeIndividualMale
Primary Taxonomy207P00000X
Provider Legal NameDR. WILLIAM B GREGORYCredential: MD
Location Address100 W CALIFORNIA BLVDPasadena, CA 91105-3010
Mailing AddressPo Box 60259Los Angeles, CA 90060-0259 · (626) 447-0296 · Fax (626) 447-6057
Phone(626) 397-3445
Fax(626) 397-5643
Sole ProprietorNo
Medical School CMSMedical University Of South Carolina College Of MedicineGraduated 1999
Enumeration DateApril 22, 2006
Last NPPES UpdateJune 13, 2008
✔ NPI 1659337350 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyEmergency MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207P00000X
License✔ Licensed in CA · A78714
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.
100 W CALIFORNIA BLVD, Pasadena, CA 91105
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Other Identifiers 4

Medicare UPINH89495
Medicare PINWA78714CCA
Medicare PINWA78714DCA
MedicaidOOA787140CA

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Baylor Scott and White Health Plan, Blue Cross and Blue Shield of Texas, Molina Healthcare and more.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. William B Gregory 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 ID8022904630
PECOS Enrollment IDI20140602001903
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 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.
62 services60 patients
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.
50 services49 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.
21 services21 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.
18 services18 patients

Hospital Affiliations CMS Care Compare 4

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

Northern Nevada Medical Center

Acute Care Hospitals · Sparks, NV
3/5 CMS rating
OwnershipProprietary
CMS Certification Number290032
Location2375 E Prater WaySparks, NV 89434 · Washoe County
Emergency services

Tmc- Bonham Hospital

Critical Access Hospitals · Bonham, TX
OwnershipGovernment - Hospital District or Authority
CMS Certification Number451370
Location504 Lipscomb StreetBonham, TX 75418 · Fannin County
Emergency services

Baylor Emergency Medical Center At Aubrey

Acute Care Hospitals · Aubrey, TX
OwnershipProprietary
CMS Certification Number670062
Location26791 Highway 380Aubrey, TX 76227 · Denton County
Emergency services

Baylor Scott And White Emergency Hospital

Acute Care Hospitals · Burleson, TX
OwnershipProprietary
CMS Certification Number670107
Location12500 South Freeway Suite 100Burleson, TX 76028 · Johnson County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 91105 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
$96.36 typical visit price
range $62.96 – $187.60
Typical copayment $24.09 (range $15.74 – $46.90)
Most-billed visit code 99203
Established Patient
$109.96 typical visit price
range $20.84 – $153.61
Typical copayment $27.49 (range $5.21 – $38.40)
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.

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.

SARAH STEPHENS NP
Nurse Practitioner (Acute Care)
100 W CALIFORNIA BLVD
PASADENA, CA 91105
Los Angeles County (626) 397-8300
AUSTIN WU MD
Anesthesiology
100 W CALIFORNIA BLVD
PASADENA, CA 91105
Los Angeles County (310) 267-8654
ROMELIA JALEH BATANG GARCIA RNFA
Registered Nurse (Registered Nurse First Assistant)
100 W CALIFORNIA BLVD
PASADENA, CA 91105
Los Angeles County (626) 397-5012
DR. RICHARD A. REED MEDICAL DOCTOR
Radiology (Diagnostic Radiology)
100 W CALIFORNIA BLVD
PASADENA, CA 91105
Los Angeles County (626) 397-5139
DR. HENRY LEVENSON M.D.
Pain Medicine (Pain Medicine)
100 W CALIFORNIA BLVD
PASADENA, CA 91105
Los Angeles County (626) 256-6010
PASADENA HOSPITAL ASSOCIATION, LTD.
Rehabilitation Unit
100 W CALIFORNIA BLVD
PASADENA, CA 91105
Los Angeles County (626) 397-5555
ANIL K HANUMAN D,O.
Hospitalist
100 W CALIFORNIA BLVD
PASADENA, CA 91105
Los Angeles County (626) 397-8300
DR. NICHOLAS WITHROW GRECO M.D.
Emergency Medicine
100 W CALIFORNIA BLVD
PASADENA, CA 91105
Los Angeles County (626) 397-5112

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 William Gregory's NPI number?

The NPI number for William Gregory is 1659337350. It was assigned to this individual provider in the NPPES registry on April 22, 2006.

Where is William Gregory located?

William Gregory practices at 100 W California Blvd, Pasadena, CA 91105. The listed phone number is (626) 397-3445.

What is William Gregory's specialty?

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

Is William Gregory enrolled in Medicare?

Yes. William Gregory 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 William Gregory accept?

Health plans from Baylor Scott and White Health Plan, Blue Cross and Blue Shield of Texas, Molina Healthcare and Oscar Insurance Company list William Gregory 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 William Gregory affiliated with any hospitals?

According to CMS data, William Gregory is affiliated with Northern Nevada Medical Center, Tmc- Bonham Hospital, Baylor Emergency Medical Center At Aubrey and Baylor Scott And White Emergency Hospital.

When was this NPI record last updated?

The NPPES record for William Gregory was last updated on June 13, 2008. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 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.