Dr. Andrew Richard Williams , MD
Internal Medicine • Pasadena, CA
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Professional Overview & Biography Verified Profile Summary
Dr. Andrew Williams, MD is a registered Internal Medicine practitioner in Pasadena, CA. With approximately 13 years of clinical practice since completing medical education in 2013, Dr. Williams provides healthcare services at the registered practice location at 100 W CALIFORNIA BLVD.
Dr. Williams is affiliated with Healthcare Partners Affiliates Medical Group and accepts Medicare assignment.
Frequently performed procedures and clinical services include subsequent hospital care with moderate levelof medical decision making, if using time, at least, hospital discharge day management, more than, initial hospital care with straightforward or low-level medical decision making, if using time, at least. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.
Practice Location & Contact Primary Location
100 W California Blvd
Pasadena, CA 911053010
Medicare Profile & Education
Other
2013
✓ Accepts Assignment
In-Person Only
Specialty Benchmarks & Practice Insights
Comparative analytics for Internal Medicine in Pasadena, CA
Practicing in Pasadena, CA (18502 Statewide)
In-Person Office Visits Only
Under CMS Medicare Fee Schedule vs Standard Submitted Charges
Clinical Seniority & Experience Comparison
Performed Procedures & Service Volume
Top Medicare Part B procedures performed by this practitioner
| HCPCS Code & Description | Services | Patients | Submitted Charge | Medicare Allowed |
|---|---|---|---|---|
|
99233
Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes
|
55 | 18 | $170.00 | $104.91 |
Medical Specialties & State Licenses
CMS Verified: 2026-01-15NUCC Taxonomy Code: 207R00000X
A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.
Hospital & Practice Group Affiliations
Healthcare Partners Affiliates Medical Group
301 S Fair Oaks Ave, Pasadena, CA 911052562
Phone: 6268213530
Practice Associates & Co-Workers
Healthcare professionals and specialists practicing at this location or sharing practice phone/fax
Internal Medicine
Doctor of Medicine (M.D.)
Nurse Practitioner - Psychiatric/Mental Health
Student in an Organized Health Care Education/Training Program
Doctor of Medicine (M.D.)
Student in an Organized Health Care Education/Training Program
Doctor of Medicine (M.D.)
Registered Nurse - Psychiatric/Mental Health, Adult
Registered Nurse
Student in an Organized Health Care Education/Training Program
Doctor of Medicine (M.D.)
Career & Practice History Timeline
Chronological log of verified NPI updates, location relocations, credentials, and registry changes
Registered at PO BOX 35380, LAS VEGAS, NV 891335380 (Tel: 7025793203)
Internal Medicine (License #A135707 in CA)
NPI status registered as active in NPPES database
Registered at 100 W CALIFORNIA BLVD, PASADENA, CA 911053010 (Tel: 6263975000)
Registered at 1616 DELTA ST, #101, LOS ANGELES, CA 900262678 (Tel: 4088023538)
Recorded as ANDREW WILLIAMS, M.D.
Student in an Organized Health Care Education/Training Program
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
Mailing Address
Po Box 35380
Las Vegas, NV 891335380
Phone: 7025793203
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.