Ruey Jen Chang, PA

  • Monterey Park, CA
  • Physician assistant
NPI1699064006PAC ID6901083831
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
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Personal email
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Mobile number
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Social profiles

Primary practice

Arthritis and Osteoporosis Medical Center, Inc

Monterey Park, California

See all 3 affiliations

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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 and contact details
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
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Mobile number
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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, Inc
    2063 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.

See all 3 affiliations for Ruey Chang

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.

EHR by site
SiteEHR vendor and product
Arthritis and Osteoporosis Medical Center, IncAvailable with a free account
+1 more affiliated siteAvailable 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, CaliforniaPrimaryLicense PA20204 · taxonomy 363AM0700X

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.

2,381physician assistants in California
2physician assistants in Monterey Park

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.

Medicare services, 20243,495
Medicare patients248
Paid by Medicare$76,563
Procedure codes13

Ruey Chang's Medicare services by type, 2024

  1. Drugs given in the office2,869
  2. Office and hospital visits306
  3. Surgery130
  4. Tests and treatments103
  5. 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.

Medicare patients, 2024248
Average age72
Average risk score1.47
Also on Medicaid82%

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

  1. Arthritis75%
  2. High blood pressure75%
  3. High cholesterol75%
  4. Osteoporosis59%
  5. Diabetes47%
  6. Chronic kidney disease36%
  7. Mood disorders25%
  8. 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.

Part D claims, 2024156
Drugs named by CMS2
Total drug cost$781
Part D patients61

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.

See all prescribing by Ruey Chang

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.

See all payments to Ruey Chang

Source: Open Payments (CMS), 2025 data, released July 7, 2026

Sources for Ruey Jen Chang's profile data

Sources for the data on this page
Data on this pageSource
NPI, name, sex, specialty and licensesNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data
Practice locations and phoneNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice Data
Primary practice, affiliations and health systemNPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data
Medicare services and procedure codesMedicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab)
State medians for the same specialtyDmand AI Peer Benchmarks
Medicare patients and the all-payer patient panelDmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab)
Part D prescribingMedicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab)
MIPS scores, telehealth, assignment and procedure percentilesDoctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab)
Industry paymentsOpen Payments (CMS) (opens in a new tab)
EHR at each practice siteDmand AI Technology Install Data
Similar physiciansDmand AI Affiliation Data

Data last refreshed October 2026Report an inaccuracyRemove my information

FAQ

Frequently asked questions about Ruey Jen Chang

Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.

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.

Show 4 more questionsShow fewer questions

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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