Dr. Allen Chang, MD
- Medicare services, 2022
- 14
- Medicare patients, 2024
- 17
- Part D claims, 2024
- 2,696
- Industry payments
- $1,947
- Affiliated sites
- 3
- Practice address
- 9400 Rosecrans Avenue, Bellflower, CA 90706
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Kaiser Permanente Medical Group Bellflower Medical Offices - HOPD
Acute Care Hospital outpatient department · Bellflower, California
Find Dr. Chang's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Allen Chang is a urologist in Bellflower, California
Dr. Chang practices at Kaiser Permanente Medical Group Bellflower Medical Offices - HOPD in Bellflower, California.
Dr. Chang's NPI, 1669765657, was assigned on May 24, 2011. Dr. Chang graduated from Feinberg School of Medicine in 2008. Dr. Chang holds California license A109778.
- NPI
- 1669765657NPI Registry (opens in a new tab)
- Medicare PAC ID
- 3072783166
- NPI enumeration date
- May 24, 2011
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 44
- Medical school graduation
- 2008
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Allen Chang practices at Kaiser Permanente Medical Group Bellflower Medical Offices - HOPD in Bellflower, California
Dr. Chang's primary practice is Kaiser Permanente Medical Group Bellflower Medical Offices - HOPD, at 9400 Rosecrans Avenue, Bellflower, CA 90706.
- Kaiser Permanente Medical Group Bellflower Medical Offices - HOPD9400 Rosecrans Avenue, Bellflower, CA 90706
Source: Dmand AI Affiliation Data
Dr. Allen Chang is affiliated with 3 sites of care and 1 medical group
Dr. Chang's primary practice is Kaiser Permanente Medical Group Bellflower Medical Offices - HOPD in Bellflower, California. The medical group on file is Southern California Permanente Medical Group. Dmand AI also links Dr. Chang to 1 more breast imaging center and 1 group practice or clinic, each named with a free account. Dr. Chang's employer is on file too: a hospital.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Allen Chang's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Chang practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Kaiser Permanente Medical Group Bellflower Medical Offices - HOPD | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Allen Chang is one of 1,395 urologists in California
Urology is Dr. Chang's primary specialty in the NPI Registry, under taxonomy code 208800000X. Dr. Chang is board certified in urology by the American Board of Urology. Dr. Chang is licensed in California.
Specialties and state licenses
- Urology, CaliforniaPrimary
Clinical focus
Dmand AI lists enlarged prostate, urinary endoscopy and urine flow blockage among the conditions Dr. Chang treats.
Urologists near Dr. Chang
Counts of urologists 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
Dr. Allen Chang billed Medicare for 14 services in 2022
CMS data shows 14 Medicare services from Dr. Chang across 1 procedure code in 2022, all of them office visits, for 17 Medicare patients. Medicare paid $1,300 for them. Every service was in an office.
Dr. Chang's Medicare services by type, 2020 to 2022
- 2020
- 2022
- Office and hospital visits
- 2020: 142022: 14No change
Dr. Chang compared with the California median for urologists, 2022
- Dr. Chang
- California median
- Medicare services
- 14vs 1,05099% below
- Medicare patients
- 17vs 34695% below
- Part D claims
- 2,595vs 6424.0 times
Medians across 1,310 urologists in California with Dmand AI profiles that report each measure.
Dr. Chang's most billed Medicare procedure codes, 2022
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Chang?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Chang and other urologists in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Allen Chang treated 17 Medicare patients in 2024, average age 71
CMS counts 17 Medicare patients who saw Dr. Chang in 2024. 65% of them have high cholesterol. Their average risk score is 2.27, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Chang's median patient age at 70, with 30% women.
Chronic conditions among Dr. Chang's Medicare patients, 2024
- High cholesterol65%
Share of Medicare patients with each condition. A patient can have several.
Dr. 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 70
Patient panel by sex, all payers
- Women30%
- Men70%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Allen Chang wrote 2,696 Medicare Part D claims in 2024
In 2024, Dr. Chang wrote 2,696 Medicare Part D claims for 764 patients. 94% of them were for generic drugs. CMS names the drug for 2,595 of them, across 22 drugs with 11 or more claims each, at $175,143 in total drug cost. In 2023, CMS named 2,405 claims across 20 drugs.
Dr. Chang's Part D claims by kind of drug, 2024
- Generic2,547 claims94%
- Brand-name109 claims4%
- Other40 claims1%
Dr. 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 Dr. Chang's Part D claims, 2024
- Opioids3%74 of 2,696 claims
- Antibiotics12%317 of 2,696 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 2,4052024: 2,5958%
Drugs named by CMS: 22 in 2024, 20 in 2023.
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
Dr. Allen Chang offers telehealth to Medicare patients
Dr. Chang accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Chang as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Allen Chang received $1,947 in industry payments from 2016 to 2025
CMS Open Payments shows 22 general payments to Dr. Chang from 9 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Boston Scientific Corporation paid the most, $774.
General payments to Dr. Chang by program year, 2016 to 2025
Companies that paid Dr. Chang the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Allen Chang graduated from Feinberg School of Medicine
Dr. Chang graduated from Feinberg School of Medicine in 2008.
- Medical school
- Board certified in urology
Source: Dmand AI Professional Profile Data
Dr. Allen Chang accepts plans from 2 insurance carriers
Dr. Chang is in network with 2 carriers, including Kaiser Permanente and CMS Medicare. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
- Kaiser Permanente
- CMS Medicare
Plan types Dr. Chang accepts, by number of carriers
- EPO1
- HMO1
- Medicare1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Allen Chang's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare 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 percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Allen 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 Dr. Allen Chang's NPI number?
Dr. Allen Chang's NPI number is 1669765657. It was assigned on May 24, 2011, and it is active in the NPI Registry.
What kind of doctor is Dr. Allen Chang?
Dr. Allen Chang is a urologist in Bellflower, California. The primary specialty in the NPI Registry is Urology Physician (taxonomy code 208800000X).
Where does Dr. Allen Chang practice?
Dr. Chang practices at 9400 Rosecrans Avenue, Bellflower, CA 90706. Dr. Chang's primary practice is Kaiser Permanente Medical Group Bellflower Medical Offices - HOPD in Bellflower, California. Dmand AI also links Dr. Chang to 1 breast imaging center and 1 group practice or clinic.
What is Dr. Allen Chang's medical license number?
Dr. Chang holds California license A109778.
What medical group is Dr. Allen Chang part of?
Dr. Chang is linked to Southern California Permanente Medical Group.
Does Dr. Allen Chang accept Medicare?
Yes. CMS data shows Dr. Chang billed Medicare for 14 services in 2022, and Dr. Chang accepts Medicare assignment.
Does Dr. Allen Chang offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Chang as offering telehealth services.
How many Medicare patients does Dr. Allen Chang see?
CMS counts 17 Medicare patients who saw Dr. Chang in 2024, with an average age of 71.
Is Dr. Allen Chang board certified?
Yes. Dr. Chang is board certified in urology by the American Board of Urology.
What services does Dr. Allen Chang bill to Medicare?
In 2022, Dr. Chang's most billed Medicare services were office visit, established patient (99214).
Show 5 more questionsShow fewer questions
Where did Dr. Allen Chang go to medical school?
Dr. Chang graduated from Feinberg School of Medicine in 2008.
What drugs does Dr. Allen Chang prescribe most?
In 2024 Medicare Part D data, Dr. Chang's most prescribed drugs by claims were Finasteride, Tamsulosin HCl and Ciprofloxacin HCl.
Has Dr. Allen Chang received payments from drug or device companies?
CMS Open Payments shows $1,947 in general payments to Dr. Chang from 9 companies from 2016 to 2025. The largest total came from Boston Scientific Corporation.
How long has Dr. Allen Chang been practicing?
Dr. Chang graduated from medical school in 2008, 18 years ago.
What insurance does Dr. Allen Chang accept?
Dr. Chang is in network with 2 carriers, including Kaiser Permanente and CMS Medicare. EPO plans come from the most carriers, 1. Check the plan with the practice before a visit.
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