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DR. BYRON WILLIAMS M.D.
NPI 1295790319
Internal Medicine - Infectious Disease in Glendale, CA

Active since April 20, 2006PECOS EnrolledAccepts Medicare Assignment
84.99/100
CMS Quality Rating
801 SOUTH CHEVY CHASE DRIVE #105, GLENDALE, CA 91205(818) 242-5299(818) 637-7607 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

About Dr. Byron Williams M.d. NPPES

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

DR. BYRON WILLIAMS M.D. (NPI 1295790319) is an individual infectious disease provider in Glendale, California, licensed in California (G76616) and active in the NPI registry since April 2006. He is enrolled in Medicare PECOS and is a graduate of Howard University College Of Medicine (1991).

NPPES Registry Identity

NPI1295790319
Entity TypeIndividualMale
Primary Taxonomy207RI0200X
Provider Legal NameDR. BYRON WILLIAMSCredential: M.D.
Location Address801 SOUTH CHEVY CHASE DRIVE #105Glendale, CA 91205
Mailing Address801 South Chevy Chase Drive #105Glendale, CA 91205 · (818) 242-5299 · Fax (818) 637-7607
Phone(818) 242-5299
Fax(818) 637-7607
Sole ProprietorNo
Medical School CMSHoward University College Of MedicineGraduated 1991
Enumeration DateApril 20, 2006
Last NPPES UpdateJuly 13, 2026
✔ NPI 1295790319 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Infectious DiseaseAllopathic & Osteopathic Physicians
Taxonomy Code207RI0200X
License✔ Licensed in CA · G76616
Definition
An internist who deals with infectious diseases of all types and in all organ systems. Conditions requiring selective use of antibiotics call for this special skill. This physician often diagnoses and treats AIDS patients and patients with fevers which have not been explained. Infectious disease specialists may also have expertise in preventive medicine and travel medicine.

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

Dr. Byron Williams M.d. 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 ID7315063732
PECOS Enrollment IDI20100923000114
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

2

Medicare enrollment records show Byron Williams reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Antaki & Associates Infectious Disease Medical Group Inc
Infectious Disease
801 S CHEVY CHASE DR, 101
Glendale, CA 91205
  • Reassigned Medicare billing, California enrollment
  • 7 clinicians in this Medicare group
NPI 1124083274 (818) 242-5299
White Memorial Medical Center
General Acute Care Hospital
1720 E CESAR E CHAVEZ AVE
Los Angeles, CA 90033
  • Reassigned Medicare billing, California enrollment
  • 131 clinicians in this Medicare group
NPI 1215927470 (323) 268-5000

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 5

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.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
259 services124 patients
Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes 99221
Initial hospital inpatient care refers to the first day of your stay in the hospital. This service typically includes a 30-minute check-up with a healthcare professional. They'll assess your health, discuss your condition, and plan your treatment. It's part of ensuring you receive the best possible care.
138 services134 patients
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
65 services62 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.
28 services12 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.
22 services12 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 91205 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
$142.39 typical visit price
range $62.96 – $187.60
Typical copayment $35.59 (range $15.74 – $46.90)
Most-billed visit code 99204
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.

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.

84.99/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality61.01
Promoting Interoperability96
Improvement Activities40
Cost58.98

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 Byron Williams's NPI number?

The NPI number for Byron Williams is 1295790319. It was assigned to this individual provider in the NPPES registry on April 20, 2006.

Where is Byron Williams located?

Byron Williams practices at 801 South Chevy Chase Drive #105, Glendale, CA 91205. The listed phone number is (818) 242-5299.

What is Byron Williams's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Infectious Disease, with taxonomy code 207RI0200X.

Is Byron Williams enrolled in Medicare?

Yes. Byron Williams 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 Byron Williams's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Byron Williams reassigns Medicare benefits to 2 organizations: Antaki & Associates Infectious Disease Medical Group Inc (Glendale, CA) and White Memorial Medical Center (Los Angeles, CA). 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 Byron Williams's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Byron Williams was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.