Active NPI 1659337350 Individual Practitioner Male Practitioner

Dr. William B Gregory , MD

Emergency Medicine • Pasadena, CA

✓ Accepts Medicare Assignment

Professional Overview & Biography Verified Profile Summary

Dr. William Gregory, MD is a certified Emergency Medicine practicing in Pasadena, CA. With approximately 27 years of clinical experience since graduating from Medical University Of South Carolina College Of Medicine in 1999, Dr. Gregory delivers high-quality medical care to the local community at 100 W CALIFORNIA BLVD.

Dr. Gregory maintains professional affiliations with Hospitalist Medicine Physicians Of Texas - Cypress Pllc, Third Coast Emergency Physicians Southwest Pa and accepts Medicare assignment.

Frequently performed procedures and clinical services include emergency department visit with moderate level of medical decision making, emergency department visit for life threatening or functioning severity, emergency department visit with low level of medical decision making. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.

Practice Location & Contact Primary Location

Practice Address

100 W California Blvd

Pasadena, CA 911053010

Telephone 6263973445

Fax 6263975643

Associated Practice Facility / Clinic

🏢 The Hill Medical Corporation Facility NPI 1154310415

Medicare Profile & Education

Medical School

Medical University Of South Carolina College Of Medicine

Graduation Year

1999

Medicare Assignment

✓ Accepts Assignment

Telehealth Flag

In-Person Only

Specialty Benchmarks & Practice Insights

Comparative analytics for Emergency Medicine in Pasadena, CA

Senior Veteran Specialist (>20 Yrs)

Practitioner Clinical Experience

27 Yrs +3.3 yrs vs City Avg

City Avg: 23.7 Yrs

State Avg: 22.9 Yrs

Regional Practice Density

52 Specialists

Practicing in Pasadena, CA (7995 Statewide)

Telehealth Adoption Rate

1.9% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount

87.1% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Gregory (27 Years) 27 Yrs

Pasadena Specialty Average (23.7 Years) 23.7 Yrs

Performed Procedures & Service Volume

Top Medicare Part B procedures performed by this practitioner

CMS Official Data (2024)

Reporting Year:

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99284 Emergency department visit with moderate level of medical decision making	62	60	$841.30	$116.83
99285 Emergency department visit for life threatening or functioning severity	50	49	$1248.83	$166.11
99283 Emergency department visit with low level of medical decision making	21	21	$633.92	$68.40
93010 Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only	18	18	$51.38	$7.79

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99284 Emergency department visit with moderate level of medical decision making	84	84	$871.77	$119.52
99285 Emergency department visit for life threatening or functioning severity	44	43	$1205.18	$173.72
93010 Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only	18	16	$57.74	$7.92

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99285 Emergency department visit for life threatening or functioning severity	86	84	$1243.91	$181.65
99284 Emergency department visit with moderate level of medical decision making	51	49	$919.65	$125.31
99283 Emergency department visit with low level of medical decision making	25	25	$569.80	$74.18
93010 Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only	20	20	$37.00	$8.40

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99285 Emergency department visit for life threatening or functioning severity	72	70	$1264.28	$183.52
99284 Emergency department visit with moderate level of medical decision making	25	25	$764.88	$126.78
99283 Emergency department visit with low level of medical decision making	24	24	$454.33	$74.63
93010 Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only	14	13	$52.36	$8.54

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99285 Emergency department visit for life threatening or functioning severity	91	90	$1192.92	$177.91
99284 Emergency department visit with moderate level of medical decision making	62	60	$500.91	$122.53
99283 Emergency department visit with low level of medical decision making	46	45	$223.15	$66.37
93010 Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only	30	29	$60.39	$8.65

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99285 Emergency department visit for life threatening or functioning severity	157	154	$1515.54	$174.89
93010 Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only	87	82	$54.12	$8.65
99284 Emergency department visit with moderate level of medical decision making	57	56	$902.15	$119.41
99283 Emergency department visit with low level of medical decision making	39	37	$237.38	$62.99
99282 Emergency department visit with straightforward medical decision making	17	17	$57.20	$40.34

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99285 Emergency department visit for life threatening or functioning severity	149	145	$1324.05	$171.71
99284 Emergency department visit with moderate level of medical decision making	94	92	$606.78	$118.57
99283 Emergency department visit with low level of medical decision making	48	48	$326.58	$61.14
99282 Emergency department visit with straightforward medical decision making	21	21	$154.13	$41.74

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99285 Emergency department visit for life threatening or functioning severity	240	238	$2006.98	$168.42
93010 Routine electrocardiogram (ecg) using at least 12 leads with interpretation and report only	148	143	$105.64	$8.23
99284 Emergency department visit with moderate level of medical decision making	119	112	$1032.23	$116.52
99283 Emergency department visit with low level of medical decision making	55	54	$588.33	$61.57

Medical Specialties & State Licenses

Emergency Medicine Primary Specialty

NUCC Taxonomy Code: 207P00000X

State License CA A78714

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.

Additional State Medicaid & Healthcare Payer Identifiers

Medicaid State Provider ID

OOA787140 (CA)

Hospital & Practice Group Affiliations

Third Coast Emergency Physicians Southwest Pa

4103 N Loop 1604, San Antonio, TX 782491395

Phone: 2105728415

Hospitalist Medicine Physicians Of Texas - Cypress Pllc

504 Lipscomb St, Bonham, TX 754184028

Phone: 9035838585

Practice Associates & Co-Workers

Healthcare professionals and specialists practicing at this location or sharing practice phone/fax

20 Associated Practitioners

Dr. Ridgely Muller , MD

Emergency Medicine

NPI 1003920497

Doctor of Medicine (M.D.)

Dr. Paul Rhee , MD

Emergency Medicine

NPI 1063526747

Doctor of Medicine (M.D.)

Dr. Asbasia Mikhail , MD

Emergency Medicine

NPI 1114031515

Doctor of Medicine (M.D.)

Sierra Snyder , PA

Physician Assistant

NPI 1144335050

Physician Assistant

Dr. Roy Antelyes , MD

Emergency Medicine

NPI 1275648610

Doctor of Medicine (M.D.)

Dr. Roger Yang , MD

Emergency Medicine

NPI 1295849883

Doctor of Medicine (M.D.)

Career & Practice History Timeline

Chronological log of verified NPI updates, location relocations, credentials, and registry changes

6 Historical Events

✅

NPI Profile Active June 13, 2008

NPI status registered as active in NPPES database

📍

Updated Practice Location June 13, 2008

Registered at 100 W CALIFORNIA BLVD, PASADENA, CA 911053010 (Tel: 6263973445)

📍

Updated Business Mailing Address June 13, 2008

Registered at PO BOX 60259, LOS ANGELES, CA 900600259 (Tel: 6264470296)

👤

Provider Name / Credentials Updated June 13, 2008

Recorded as WILLIAM GREGORY, MD

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) June 13, 2008

Emergency Medicine (License #A78714 in CA)

🟢

Initial NPI Registration & Enumeration April 22, 2006

First registered as active Individual Practitioner in NPPES Database.

Patient & Community Reviews

Verified patient ratings, medical care experiences, and facility photos

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NPI Administrative Meta

NPI Number: 1659337350

Entity Type:

Individual Provider Physician, Nurse Practitioner, or Solo Healthcare Professional (Type 1 NPI)

Enumeration Date: April 22, 2006

Last Update: June 13, 2008

Sole Proprietor: No

Update or Correct Profile

Mailing Address

Po Box 60259

Los Angeles, CA 900600259

Phone: 6264470296

Public Domain Record This profile contains public domain information published by CMS and NPPES under the Freedom of Information Act (FOIA).

⚠️ Medical Disclaimer

This directory listing is for informational purposes only and does not constitute medical advice, diagnosis, or physician endorsement. If you are experiencing a medical emergency, please call 911 immediately.