Active NPI 1851327100 Individual Practitioner Male Practitioner

Dr. Stephen Yoon , MD

Internal Medicine • Fullerton, CA

✓ Accepts Medicare Assignment

Professional Overview & Biography Verified Profile Summary

Dr. Stephen Yoon, MD is a certified Internal Medicine practicing in Fullerton, CA. With approximately 28 years of clinical experience since graduating from Rutgers New Jersey Medical School in 1998, Dr. Yoon delivers high-quality medical care to the local community at 101 E VALENCIA MESA DR.

Dr. Yoon is affiliated with Providence Medical Foundation 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

Practice Address

101 E Valencia Mesa Dr

Fullerton, CA 928353809

Telephone 7149923000

Associated Practice Facility / Clinic

🏢 Fullerton Anesthesia Associates, A Medical Group, Inc. Facility NPI 1144278433

Medicare Profile & Education

Medical School

Rutgers New Jersey Medical School

Graduation Year

1998

Medicare Assignment

✓ Accepts Assignment

Telehealth Flag

In-Person Only

Specialty Benchmarks & Practice Insights

Comparative analytics for Internal Medicine in Fullerton, CA

Senior Veteran Specialist (>20 Yrs)

Practitioner Clinical Experience

28 Yrs +3.4 yrs vs City Avg

City Avg: 24.6 Yrs

State Avg: 26.6 Yrs

Regional Practice Density

45 Specialists

Practicing in Fullerton, CA (18502 Statewide)

Telehealth Adoption Rate

26.7% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount

63.8% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Clinical Seniority & Experience Comparison

Dr. Yoon (28 Years) 28 Yrs

Fullerton Specialty Average (24.6 Years) 24.6 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
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	228	134	$337.00	$122.41
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	222	120	$224.47	$81.15
99239 Hospital discharge day management, more than 30 minutes	114	111	$329.00	$119.48
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	50	49	$371.00	$134.76
99238 Hospital discharge day management, 30 minutes or less	30	29	$234.00	$84.41
99231 Follow-up hospital inpatient care per day, typically 15 minutes	19	17	$140.00	$50.59

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	303	166	$185.01	$82.87
99233 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 50 minutes	294	135	$266.00	$125.14
99238 Hospital discharge day management, 30 minutes or less	85	85	$188.00	$85.79
99239 Hospital discharge day management, more than 30 minutes	64	63	$276.00	$121.30
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	46	46	$350.00	$136.75
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	18	18	$514.00	$182.46

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	342	156	$266.00	$109.97
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	255	139	$185.00	$76.30
99239 Hospital discharge day management, more than 30 minutes	95	95	$276.00	$113.94
99238 Hospital discharge day management, 30 minutes or less	36	36	$188.00	$77.94
99217 Hospital observation care on day of discharge	28	28	$187.00	$77.54
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	21	21	$350.00	$144.65
99225 Subsequent observation care, typically 25 minutes per day	18	17	$184.00	$75.92
99231 Follow-up hospital inpatient care per day, typically 15 minutes	13	12	$100.00	$41.21
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	13	13	$514.00	$213.68

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	333	141	$169.00	$111.67
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	77	58	$126.00	$77.78
99238 Hospital discharge day management, 30 minutes or less	52	52	$144.00	$78.83
99239 Hospital discharge day management, more than 30 minutes	50	50	$214.00	$116.14
99217 Hospital observation care on day of discharge	31	31	$153.00	$78.84
99221 Initial hospital inpatient care per day, typically 30 minutes	14	14	$159.00	$108.82
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	13	13	$337.00	$216.64

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	270	136	$169.00	$114.19
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	87	60	$126.00	$78.95
99238 Hospital discharge day management, 30 minutes or less	86	84	$144.00	$80.65
99496 Transitional care management services for problem of high complexity	32	32	$606.00	$277.73
99218 Hospital observation care typically 30 minutes	25	25	$164.00	$109.46
99221 Initial hospital inpatient care per day, typically 30 minutes	21	21	$159.00	$110.94
99217 Hospital observation care on day of discharge	21	21	$153.00	$80.31
99219 Hospital observation care, typically 50 minutes	13	13	$265.00	$148.69

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	436	185	$169.00	$111.91
99238 Hospital discharge day management, 30 minutes or less	93	93	$144.00	$79.47
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	89	64	$126.00	$78.35
99217 Hospital observation care on day of discharge	58	58	$153.00	$78.10
99219 Hospital observation care, typically 50 minutes	29	28	$265.00	$146.32
99239 Hospital discharge day management, more than 30 minutes	27	27	$214.00	$116.60
99218 Hospital observation care typically 30 minutes	18	18	$164.00	$106.94
99221 Initial hospital inpatient care per day, typically 30 minutes	14	14	$159.00	$108.53
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	11	11	$258.00	$147.20

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	440	181	$169.00	$111.32
99238 Hospital discharge day management, 30 minutes or less	73	72	$144.00	$78.83
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	50	41	$126.00	$77.73
99239 Hospital discharge day management, more than 30 minutes	41	41	$214.00	$113.63
99217 Hospital observation care on day of discharge	37	37	$153.00	$78.83
99220 Hospital observation care, typically 70 minutes	24	24	$336.00	$198.93
99219 Hospital observation care, typically 50 minutes	22	22	$265.00	$145.21
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	11	11	$337.00	$216.45
99218 Hospital observation care typically 30 minutes	11	11	$164.00	$106.34

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	316	129	$169.00	$111.03
99232 Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes	110	82	$126.00	$76.63
99238 Hospital discharge day management, 30 minutes or less	71	69	$144.00	$78.48
99220 Hospital observation care, typically 70 minutes	47	46	$336.00	$198.95
99223 Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes	31	31	$337.00	$216.89
99217 Hospital observation care on day of discharge	28	28	$153.00	$78.78
99239 Hospital discharge day management, more than 30 minutes	20	19	$214.00	$111.29
99222 Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes	14	14	$258.00	$146.27

Medical Specialties & State Licenses

Internal Medicine Primary Specialty

NUCC Taxonomy Code: 207R00000X

State License CA A71645

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

Providence Medical Foundation

1950 Sunny Crest Dr, Fullerton, CA 928353641

Phone: 7149925350

Providence Medical Foundation

1514 Valley Vista Dr, Diamond Bar, CA 917653929

Phone: 9098601144

Providence Medical Foundation

100 E Valencia Mesa Dr, Fullerton, CA 928353816

Phone: 7148713006

Practice Associates & Co-Workers

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

26 Associated Practitioners

Daniel Graviloni , RCP

Respiratory Therapist, Registered - Neonatal/Pediatrics

NPI 1073072963

Alicia Perez Varela , AGPCNP

Nurse Practitioner - Gerontology

NPI 1104788553

Janet Kong , NP

Nurse Practitioner

NPI 1114309192

Nurse Practitioner

Dr. Alex Ly , MD

Internal Medicine

NPI 1134380173

Doctor of Medicine (M.D.)

Justin De Leon

Registered Nurse

NPI 1194217182

Dr. Tuan Trinh , MD

Internal Medicine

NPI 1205924040

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 May 13, 2015

NPI status registered as active in NPPES database

📍

Updated Practice Location May 13, 2015

Registered at 101 E VALENCIA MESA DR, FULLERTON, CA 928353809 (Tel: 7149923000)

📍

Updated Business Mailing Address May 13, 2015

Registered at 101 E VALENCIA MESA DR, FULLERTON, CA 928353809 (Tel: 7149923000)

👤

Provider Name / Credentials Updated May 13, 2015

Recorded as STEPHEN YOON, M.D.

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) May 13, 2015

Internal Medicine (License #A71645 in CA)

🟢

Initial NPI Registration & Enumeration June 25, 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: 1851327100

Entity Type:

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

Enumeration Date: June 25, 2006

Last Update: May 13, 2015

Sole Proprietor: No

Update or Correct Profile

Mailing Address

101 E Valencia Mesa Dr

Fullerton, CA 928353809

Phone: 7149923000

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.