Ruey Jen Chang, PA
- Medicare services, 2024
- 3,495
- Medicare patients, 2024
- 248
- Part D claims, 2024
- 156
- MIPS score, 2024
- 100
- Industry payments
- $2,147
- Practice address
- 2063 S Atlantic Blvd, Monterey Park, CA 91754
- Practice phone
- Call (323) 796-0170
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Arthritis and Osteoporosis Medical Center, Inc
Monterey Park, California
Find Ruey Chang's professional email, personal email and mobile number
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Ruey Jen Chang is a physician assistant in Monterey Park, California
Ruey Chang practices at Arthritis and Osteoporosis Medical Center, Inc in Monterey Park, California.
Ruey Chang's NPI, 1699064006, was assigned on April 6, 2011. Ruey Chang holds California license PA20204.
- NPI
- 1699064006NPI Registry (opens in a new tab)
- Medicare PAC ID
- 6901083831
- NPI enumeration date
- April 6, 2011
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (323) 796-0170
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 44
- Medical school graduation
- 2008
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Ruey Jen Chang practices at Arthritis and Osteoporosis Medical Center, Inc in Monterey Park, California
Ruey Chang's primary practice is Arthritis and Osteoporosis Medical Center, Inc, at 2063 S Atlantic Blvd, Monterey Park, CA 91754 in Los Angeles County. The practice phone is (323) 796-0170.
- Arthritis and Osteoporosis Medical Center, Inc2063 S Atlantic Blvd, Monterey Park, CA 91754 · Los Angeles CountyPhone(323) 796-0170
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Ruey Jen Chang is affiliated with 2 sites of care and 1 medical group
Ruey Chang's primary practice is Arthritis and Osteoporosis Medical Center, Inc in Monterey Park, California. The medical group on file is Arthritis and Osteoporosis Medical Center. Dmand AI also links Ruey Chang to 1 more group practice or clinic, named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Ruey Jen Chang's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Ruey Chang practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Arthritis and Osteoporosis Medical Center, Inc | Available with a free account |
| +1 more affiliated site | Available with a free account |
Source: Dmand AI Technology Install Data
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Ruey Jen Chang is one of 2,381 physician assistants in California
Medical is Ruey Chang's primary specialty in the NPI Registry, under taxonomy code 363AM0700X. Ruey Chang is licensed in California.
Specialties and state licenses
- Medical physician assistant, CaliforniaPrimary
Clinical focus
Dmand AI lists arteritis, arthritis, bursitis, carpal tunnel syndrome, chronic lung disease, gout, hand joint or tendon inflammation and joint arthropathy among the conditions Ruey Chang treats.
Physician assistants near Ruey Chang
Counts of physician assistants with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Ruey Jen Chang billed Medicare for 3,495 services in 2024
CMS data shows 3,495 Medicare services from Ruey Chang across 13 procedure codes in 2024, for 248 Medicare patients. Medicare paid $76,563 for them. Every service was in an office.
Ruey Chang's Medicare services by type, 2024
- Drugs given in the office2,869
- Office and hospital visits306
- Surgery130
- Tests and treatments103
- Imaging87
Ruey Chang compared with the California median for physician assistants, 2024
- Ruey Chang
- California median
- Medicare services
- 3,495vs 27812.6 times
- Medicare patients
- 248vs 1162.1 times
- Part D claims
- 87vs 44080% below
Medians across 1,473 physician assistants in California with Dmand AI profiles that report each measure.
Ruey Chang's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Ruey Jen Chang treated 248 Medicare patients in 2024, average age 72
CMS counts 248 Medicare patients who saw Ruey Chang in 2024. The largest group is 65 to 74, with 105 patients. 75% of them have arthritis, and 75% have high blood pressure. 82% are also on Medicaid. Their average risk score is 1.47, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Ruey Chang's median patient age at 67, with 74% women.
Ruey Chang's Medicare patients by age, 2024
Ruey Chang's Medicare patients by sex, 2024
- Women19277%
- Men5623%
Chronic conditions among Ruey Chang's Medicare patients, 2024
- Arthritis75%
- High blood pressure75%
- High cholesterol75%
- Osteoporosis59%
- Diabetes47%
- Chronic kidney disease36%
- Mood disorders25%
- Depression23%
Share of Medicare patients with each condition. A patient can have several.
Ruey Chang's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 67
Patient panel by sex, all payers
- Women74%
- Men26%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Ruey Jen Chang wrote 156 Medicare Part D claims in 2024
In 2024, Ruey Chang wrote 156 Medicare Part D claims for 61 patients. 94% of them were for generic drugs. CMS names the drug for 87 of them, across 2 drugs with 11 or more claims each, at $781 in total drug cost.
Ruey Chang's Part D claims by kind of drug, 2024
- Generic147 claims94%
- Brand-name and other9 claims6%
Ruey Chang's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Ruey Chang's Part D claims, 2024
- Opioids31%49 of 156 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
Ruey Jen Chang scored 100 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 100 out of 100 for Ruey Chang for performance year 2024, reported as part of a group. Ruey Chang accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Ruey Chang as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Ruey Chang's MIPS scores, performance year 2024
- 100of 100Final score
- 95of 100Quality
- 40of 100Improvement Activities
- 89of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Ruey Jen Chang received $2,147 in industry payments from 2024 to 2025
CMS Open Payments shows 102 general payments to Ruey Chang from 19 drug and device companies from 2024 to 2025. Food and beverage make up the largest share, 100% of the total. UCB, Inc. paid the most, $274.
General payments to Ruey Chang by program year, 2024 to 2025
Companies that paid Ruey Chang the most, 2024 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Sources for Ruey Jen Chang's profile data
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Ruey Jen Chang
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What is Ruey Jen Chang's NPI number?
Ruey Jen Chang's NPI number is 1699064006. It was assigned on April 6, 2011, and it is active in the NPI Registry.
What does Ruey Jen Chang specialize in?
Ruey Jen Chang is a physician assistant in Monterey Park, California. The primary specialty in the NPI Registry is Medical Physician Assistant (taxonomy code 363AM0700X).
Where does Ruey Jen Chang practice?
Ruey Chang practices at 2063 S Atlantic Blvd, Monterey Park, CA 91754. Ruey Chang's primary practice is Arthritis and Osteoporosis Medical Center, Inc in Monterey Park, California. Dmand AI also links Ruey Chang to 1 group practice or clinic.
What is Ruey Jen Chang's office phone number?
The practice phone on file for Ruey Chang is (323) 796-0170.
What is Ruey Jen Chang's medical license number?
Ruey Chang holds California license PA20204.
What medical group is Ruey Jen Chang part of?
Ruey Chang is linked to Arthritis and Osteoporosis Medical Center.
Does Ruey Jen Chang accept Medicare?
Yes. CMS data shows Ruey Chang billed Medicare for 3,495 services in 2024, and Ruey Chang accepts Medicare assignment.
Does Ruey Jen Chang offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Ruey Chang as offering telehealth services.
What is Ruey Jen Chang's MIPS score?
Ruey Chang's MIPS final score for performance year 2024 is 100 out of 100, reported as part of a group.
How many Medicare patients does Ruey Jen Chang see?
CMS counts 248 Medicare patients who saw Ruey Chang in 2024, with an average age of 72.
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What services does Ruey Jen Chang bill to Medicare?
In 2024, Ruey Chang's most billed Medicare services were injected or infused drug (J7332), injected or infused drug (J0897) and office visit, established patient (99214).
What drugs does Ruey Jen Chang prescribe most?
In 2024 Medicare Part D data, Ruey Chang's most prescribed drugs by claims were Pregabalin and Tramadol HCl.
Has Ruey Jen Chang received payments from drug or device companies?
CMS Open Payments shows $2,147 in general payments to Ruey Chang from 19 companies from 2024 to 2025. The largest total came from UCB, Inc.
How long has Ruey Jen Chang been practicing?
Ruey Chang graduated from medical school in 2008, 18 years ago.
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