Active NPI 1861467656 Individual Practitioner Male Practitioner

Dr. Patrick S Chang , MD

Internal Medicine • Mather, CA

Professional Overview & Biography Verified Profile Summary

Dr. Patrick Chang, MD is a registered healthcare professional specializing in Internal Medicine in Mather, CA. Practice services are available at 10535 HOSPITAL WAY under active NPI credentials.

Frequently performed procedures and clinical services include established patient outpatient office visit, injection, vitamin b-12 cyanocobalamin, up to 1000 mcg, outpatient office visit. Full Medicare procedure pricing transparency rates and service volume details are listed on this profile.

Practice Location & Contact Primary Location

Practice Address

10535 Hospital Way

Mather, CA 956554200

Telephone 9168437000

Associated Practice Facility / Clinic

🏢 Va Mather Facility NPI 1437136066

Specialty Benchmarks & Practice Insights

Comparative analytics for Internal Medicine in Mather, CA

Active Practitioner

Practitioner Clinical Experience

Active

City Avg: 19.0 Yrs

State Avg: 26.6 Yrs

Regional Practice Density

26 Specialists

Practicing in Mather, CA (18502 Statewide)

Telehealth Adoption Rate

0.0% Regional Adoption

In-Person Office Visits Only

Medicare Pricing Discount

41.5% Avg Savings

Under CMS Medicare Fee Schedule vs Standard Submitted Charges

Performed Procedures & Service Volume

Top Medicare Part B procedures performed by this practitioner

CMS Official Data (2019)

Reporting Year:

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	449	232	$136.44	$107.31
J3420 Injection, vitamin b-12 cyanocobalamin, up to 1000 mcg	85	45	$5.05	$1.72
99211 Office or other outpatient visit for the evaluation and management of established patient that may not require presence of healthcare professional	21	19	$30.33	$22.31
93882 Ultrasound of one side of head and neck blood flow	16	16	$258.00	$113.28
93979 Ultrasound scan of blood flow of aorta, vena cava, bypass graphs, or one side of the groin or limited scan	15	15	$150.00	$94.63

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	2,944	439	$136.44	$110.19
95165 Professional service for preparation and provision of 1 or more antigens	1,651	23	$15.45	$13.40
J3420 Injection, vitamin b-12 cyanocobalamin, up to 1000 mcg	661	95	$5.05	$1.96
17003 Destruction of precancer skin growth, 2-14 growths	364	21	$10.43	$5.42
99497 Advance care planning, first 30 minutes	276	264	$127.85	$87.04
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	253	253	$169.45	$121.06
G0008 Administration of influenza virus vaccine	190	187	$44.55	$19.88
90688 Vaccine for influenza for administration into muscle, 0.5 ml dosage	181	178	$45.00	$17.38
93882 Ultrasound of one side of head and neck blood flow	108	107	$258.00	$126.75
93979 Ultrasound scan of blood flow of aorta, vena cava, bypass graphs, or one side of the groin or limited scan	107	107	$150.00	$100.69
93923 Complete ultrasound study of arm and leg arteries	51	50	$243.28	$140.26
99213 Established patient office or other outpatient visit, typically 15 minutes	43	39	$89.57	$74.69
G0420 Face-to-face educational services related to the care of chronic kidney disease; individual, per session, per one hour	36	27	$195.00	$112.93
17000 Destruction of skin growth	28	21	$95.60	$67.89
G0442 Annual alcohol misuse screening, 5 to 15 minutes	19	19	$29.35	$19.14
G0444 Annual depression screening, 5 to 15 minutes	19	19	$33.55	$18.78
93000 Routine ekg using at least 12 leads including interpretation and report	19	19	$37.26	$17.40
99205 New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more	16	16	$265.67	$212.97

HCPCS Code & Description	Services	Patients	Submitted Charge	Medicare Allowed
99214 Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more	4,087	518	$136.44	$117.26
95165 Professional service for preparation and provision of 1 or more antigens	2,539	29	$15.45	$14.41
17003 Destruction of precancer skin growth, 2-14 growths	1,014	43	$10.33	$6.11
J3420 Injection, vitamin b-12 cyanocobalamin, up to 1000 mcg	855	100	$5.05	$2.94
99497 Advance care planning, first 30 minutes	549	431	$127.85	$90.39
95024 Injection of allergenic extracts into skin for immediate reaction analysis	440	11	$10.30	$8.56
G0439 Annual wellness visit, includes a personalized prevention plan of service (pps), subsequent visit	372	372	$169.68	$130.33
99213 Established patient office or other outpatient visit, typically 15 minutes	371	314	$89.99	$80.10
93979 Ultrasound scan of blood flow of aorta, vena cava, bypass graphs, or one side of the groin or limited scan	350	342	$150.23	$106.14
93882 Ultrasound of one side of head and neck blood flow	348	340	$258.00	$137.02
93923 Complete ultrasound study of arm and leg arteries	346	342	$243.29	$126.80
G0008 Administration of influenza virus vaccine	284	280	$44.54	$25.01
G0444 Annual depression screening, 5 to 15 minutes	181	181	$29.30	$20.36
90688 Vaccine for influenza for administration into muscle, 0.5 ml dosage	144	144	$45.00	$17.48
Q2035 Influenza virus vaccine, split virus, when administered to individuals 3 years of age and older, for intramuscular use (afluria)	139	139	$26.00	$17.34
G0442 Annual alcohol misuse screening, 5 to 15 minutes	111	111	$26.04	$20.47
G0420 Face-to-face educational services related to the care of chronic kidney disease; individual, per session, per one hour	81	49	$195.00	$120.19
17000 Destruction of skin growth	78	43	$95.60	$71.91
93000 Routine ekg using at least 12 leads including interpretation and report	55	54	$37.26	$18.17
99205 New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more	49	49	$265.67	$220.17
G0181 Physician or allowed practitioner supervision of a patient receiving medicare-covered services provided by a participating home health agency (patient not present) requiring complex and multidisciplinary care modalities involving regular physician or allow	49	26	$169.14	$118.56
76705 Limited ultrasound scan of abdomen	36	31	$163.41	$98.81
20610 Aspiration and/or injection of fluid from large joint	14	11	$103.34	$66.18
G0402 Initial preventive physical examination; face-to-face visit, services limited to new beneficiary during the first 12 months of medicare enrollment	12	12	$201.03	$188.81
69210 Removal of impacted ear wax	12	11	$69.42	$54.35

Medical Specialties & State Licenses

CMS Verified: 2025-12-26

Internal Medicine Primary Specialty

NUCC Taxonomy Code: 207R00000X

State License AZ 21908

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.

Additional State Medicaid & Healthcare Payer Identifiers

Medicaid State Provider ID

346967 (AZ)

Practice Associates & Co-Workers

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

40 Associated Practitioners

Alayna Nguyen

Pharmacist

NPI 1003538505

Dr. Patricia Dalton , MD

Specialist

NPI 1003898750

Doctor of Medicine (M.D.)

Brittney Reed

Nurse Practitioner

NPI 1023995446

Christina Eng

Pharmacist

NPI 1043866320

Dr. Vinny Vo , PharmD

Pharmacist

NPI 1053017293

Doctor of Pharmacy (Pharm.D.)

Jennifer Fouche , OTR, L

Occupational Therapist

NPI 1053511287

Occupational Therapist Registered, L

Career & Practice History Timeline

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

8 Historical Events

📍

Updated Practice Location December 26, 2025

Registered at 10535 HOSPITAL WAY, MATHER, CA 956554200 (Tel: 9168437000)

📍

Updated Business Mailing Address December 26, 2025

Registered at 10535 HOSPITAL WAY, MATHER, CA 956554200 (Tel: 9168437000)

✅

NPI Profile Active January 04, 2012

NPI status registered as active in NPPES database

📍

Updated Practice Location January 04, 2012

Registered at 600 S DOBSON RD, STE E39, CHANDLER, AZ 852245678 (Tel: 4807775888)

📍

Updated Business Mailing Address January 04, 2012

Registered at 600 S DOBSON RD, STE E39, CHANDLER, AZ 852245693 (Tel: 4807775888)

👤

Provider Name / Credentials Updated January 04, 2012

Recorded as PATRICK CHANG, MD

🎓

Medical Taxonomy / Specialty Registered (Primary Specialty) January 04, 2012

Internal Medicine (License #21908 in AZ)

🟢

Initial NPI Registration & Enumeration February 23, 2006

First registered as active Individual Practitioner in NPPES Database.

Patient & Community Reviews

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NPI Administrative Meta

NPI Number: 1861467656

Entity Type:

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

Enumeration Date: February 23, 2006

Last Update: December 26, 2025

Sole Proprietor: No

Update or Correct Profile

Mailing Address

10535 Hospital Way

Mather, CA 956554200

Phone: 9168437000

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.