Dr. Eric Changchien , MD
Surgery โข Riverside, CA
3660 Park Sierra Dr, Suite 105
Riverside, CA 925053081
This profile restates public CMS/NPPES data; T-MedInfo gives no medical advice — consult a licensed professional, and call 911 for emergencies.
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NPI assigned on September 30, 2008; this date does not establish years in practice.
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Published CMS data list 97 Original Medicare Part B services in 2018.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2018. Published rows only; this is not a quality measure.
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Published Part B service records, 2018:
- 99222 โ Initial hospital care with straightforward or low-level medical decision making: 51 service units.
- 99203 โ New patient outpatient office visit: 24 service units.
- 99213 โ Established patient outpatient office visit: 22 service units.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2018. Units differ by code; these are not visits or a measure of quality.
CPTยฎ only copyright 2017 American Medical Association. All rights reserved. Service names are shortened from CPT Consumer Friendly Descriptors (CMS data, 2018). CPT notice
See the full table ยท Guide: How to read Medicare Part B data
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Published CMS data list 77 Medicare Part D prescriptions, including refills, in 2024.
Source: CMS, Medicare Part D Prescribers โ by Provider and Drug, 2024. Published rows only; this is not a quality measure.
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Published Part D records, 2024:
- Hydrocodone-Acetaminophen (Hydrocodone/Acetaminophen) โ 30 prescription fills, including refills.
- Tramadol Hcl โ 22 prescription fills, including refills.
- Metronidazole โ 13 prescription fills, including refills.
Source: CMS, Medicare Part D Prescribers โ by Provider and Drug, 2024. Drug names come from pharmacy claims. Listing a drug here is not an endorsement or a recommendation.
See all 4 records in the table ยท Guide: How to read Medicare Part D prescriber data
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More Part D prescriptions than 60% of clinicians listed under Surgery in Riverside, CA (2024, 31 clinicians with data). Median for this group: 56. Middle half: 30 to 120.
More Part D prescriptions than 60% of clinicians listed under Surgery in California (2024, 1,327 clinicians with data). Median for this group: 54. Middle half: 26 to 105.
Source: CMS, Medicare Part D Prescribers โ by Provider and Drug, 2024. Billing and prescribing volume is not a quality rating.
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Medicare Part B services went from 125 in 2017 to 97 in 2018.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2017โ2018.
Practice Location & Contact Primary Location
3660 Park Sierra Dr
Suite 105
Riverside, CA 925053081
Matched by practice address or phone in NPPES. A shared address or phone does not confirm that this clinician works there.
CMS Doctors and Clinicians lists 1 group name: Southern California Permanente Medical Group. See the list
Source: CMS Doctors and Clinicians National Downloadable File, release date unavailable.
Listings do not confirm current availability, employment or a shared ownership network.
Medicare Profile & Education
Source: CMS Doctors and Clinicians National Downloadable File
Wright State University Boonshoft School Of Medicine
2007
What Public CMS Data Show
Surgery: NPPES taxonomy is a reported classification, not proof of board certification.
Medicare-allowed amount
About $10,486 in 2018
The total amount Medicare approved for these services in 2018. It includes what Medicare paid and what patients or their other insurance owed, such as the deductible and coinsurance.
It shows the total cost of this clinician's Original Medicare services under Medicare's fee rules.
What this does not show: Medicare-allowed amount
This is not the clinician's income. Part of it can go to a clinic or group practice, staff, equipment or drugs. It is not the price you will pay.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2018.
Paid by Medicare
About $8,214 in 2018
The part of the Medicare-allowed amount that Medicare itself paid in 2018, after patients' deductibles and coinsurance.
The gap between the allowed amount and this number is roughly what patients and their other insurance paid.
What this does not show: Paid by Medicare
This is not the clinician's income and not a measure of quality.
Source: CMS, Medicare Physician & Other Practitioners โ by Provider and Service, 2018.
30-day fills
77 standardized 30-day fills in 2024
CMS converts prescriptions to 30-day supplies so they can be compared. A 90-day prescription counts as about three 30-day fills.
What this does not show: 30-day fills
It is not a count of patients and not a measure of quality.
Part D drug cost
$747 in 2024
The total cost of these prescriptions in 2024, paid by Medicare drug plans, patients and other payers together.
It shows the total spending on drugs this clinician prescribed, not what any one patient paid.
What this does not show: Part D drug cost
A higher cost often reflects the type of medicines a specialty uses. It is not your out-of-pocket cost and not a measure of quality.
Source: CMS, Medicare Part D Prescribers โ by Provider and Drug, 2024.
Industry payments (Open Payments)
Fewer than 11 payment records totaling $22.10 in 2025
Drug and medical device companies must report certain payments to doctors and some other clinicians to CMS, such as meals, travel, speaking fees or research funding.
It shows reported financial ties between this clinician and companies. You can ask your clinician about them.
These records are submitted by drug and medical device companies, and a reported payment does not necessarily mean the financial relationship is improper.
General: payments not tied to research, such as meals, travel, consulting or speaking fees.
A reported payment does not necessarily mean the financial relationship is improper. Research payments can go to a hospital or university for a study the clinician leads, not to the clinician personally. Clinicians can dispute records with the company that reported them.
Source: CMS Open Payments, program year 2025.
Years since graduation
19 years (graduated 2007)
CMS Doctors and Clinicians data list 2007 as the year this clinician finished professional school.
It tells you roughly how long ago the clinician finished school.
What this does not show: Years since graduation
It is not the number of years in practice, and more years does not mean better care.
Source: CMS Doctors and Clinicians National Downloadable File.
NPI first issued
2008
The year this clinician's National Provider Identifier (NPI) was issued. An NPI is a unique 10-digit ID that US health care providers use for billing.
What this does not show: NPI first issued
NPIs have been issued only since 2005, so this year is not necessarily when the clinician started practicing.
Source: CMS NPPES NPI Registry.
Accepts Medicare assignment
CMS data list this clinician as accepting Medicare assignment. This means agreeing to take the Medicare-approved amount as full payment for covered services.
With Original Medicare, you usually pay only your deductible and coinsurance, and the office sends the claim to Medicare for you.
Medicare assignment applies to Original Medicare. It does not tell you whether the clinician is in a Medicare Advantage plan's network, accepts other insurance, or is taking new patients.
Source: CMS Doctors and Clinicians; Medicare.gov, โDoes your provider accept Medicare as full payment?โ
No telehealth indicator
CMS shows this indicator only when recent Medicare claims include telehealth services. The clinician may still offer telehealth; ask the office.
Source: CMS, Telehealth Indicator on Medicare Care Compare (fact sheet, January 2023); CMS Doctors and Clinicians.
Enrolled in Medicare (PECOS)
Dr. Changchien has a Medicare enrollment record in PECOS, the CMS system clinicians use to enroll so they can bill Medicare or order services for people with Medicare.
It does not show whether the clinician accepts assignment, is in your plan's network, or is taking new patients.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Can order Medicare-covered services
CMS lists Dr. Changchien as eligible to order or refer Medicare Part B clinical laboratory and imaging services, durable medical equipment (DME) and home health services for people with Medicare.
Medicare pays for these items and services only when they are ordered by an eligible clinician.
What this does not show: Can order Medicare-covered services
It does not mean the clinician offers these services directly.
Source: CMS Medicare Fee-For-Service Public Provider Enrollment (PECOS); CMS Order and Referring file.
Compared with the same specialty in Riverside and California
Billing and prescribing volume is not a quality rating.
Medicare Part D prescriptions
More Part D prescriptions than 60% of clinicians listed under Surgery in Riverside, CA (2024, 31 clinicians with data). Median for this group: 56. Middle half: 30 to 120.
More Part D prescriptions than 60% of clinicians listed under Surgery in California (2024, 1,327 clinicians with data). Median for this group: 54. Middle half: 26 to 105.
Part D drug cost
A higher Part D drug cost than 65% of clinicians listed under Surgery in Riverside, CA (2024, 31 clinicians with data). Median for this group: $466. Middle half: $115 to $1,049.
A higher Part D drug cost than 65% of clinicians listed under Surgery in California (2024, 1,327 clinicians with data). Median for this group: $346. Middle half: $126 to $1,126.
Medicare Part B
Comparisons use 2024 data. The latest CMS data for Dr. Changchien are from 2018.
53 active clinicians are listed under Surgery with a practice address in Riverside, CA (3,120 in California).
Addresses are self-reported to NPPES and may be out of date.
Telehealth indicator in Riverside
1.9% of these 53 clinicians have the CMS telehealth indicator.
66% of these 53 clinicians are listed by CMS as accepting Medicare assignment.
CMS data by year
Changes may reflect reporting, coverage or privacy limits, not changes in care quality.
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Medicare Part B services
Medicare Part B services decreased 22% from 125 in 2017 to 97 in 2018.
- 2017: 125
- 2018: 97
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Medicare-allowed amount
Medicare-allowed amount decreased 17% from $12,664 in 2017 to $10,486 in 2018.
- 2017: $12,664
- 2018: $10,486
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Paid by Medicare
Paid by Medicare decreased 16% from $9,827 in 2017 to $8,214 in 2018.
- 2017: $9,827
- 2018: $8,214
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Medicare Part D prescriptions
Medicare Part D prescriptions went from 16 in 2020 to 77 in 2024.
- 2020: 16
- 2021: 85
- 2022: 78
- 2023: 52
- 2024: 77
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30-day fills
30-day fills went from 16 in 2020 to 77 in 2024.
- 2020: 16
- 2021: 105
- 2022: 78
- 2023: 52
- 2024: 77
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Part D drug cost
Part D drug cost went from $144 in 2020 to $747 in 2024.
- 2020: $144
- 2021: $9,531
- 2022: $792
- 2023: $420
- 2024: $747
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Industry payments (Open Payments)
Industry payments (Open Payments) decreased 98% from $1,103.13 in 2020 to $22.10 in 2025.
- 2020: $1,103.13
- 2022: $694.58
- 2023: $53.63
- 2024: $292.45
- 2025: $22.10
Sources: CMS Medicare Physician & Other Practitioners (2018), CMS Medicare Part D Prescribers (2024), CMS Open Payments (2025), CMS Doctors and Clinicians, CMS NPPES NPI Registry. Specialty names follow the NUCC Health Care Provider Taxonomy.
Text: T-MedInfo ยท Report an error.
Pharma & Medical Device Financial Disclosures
Payments and other transfers of value that drug and medical device companies reported to CMS Open Payments
Program year 2025 (payments made January 1 โ December 31, 2025): fewer than 11 records totaling $22.10.
| Manufacturer | Payment Nature | Product | Type | Amount ($) |
|---|---|---|---|---|
| INTUITIVE SURGICAL, INC. |
Food and Beverage
In-kind items and services
|
Da Vinci Surgical System | General | $22.10 |
Source: CMS Open Payments, program year 2025, released June 30, 2026.
Performed Procedures & Service Volume
CPTยฎ is a registered trademark of the American Medical Association. CPT codes, descriptions and other data only are copyright 2016โ2017 American Medical Association. All rights reserved. Applicable FARS/HHSARS apply. Descriptions of CPT codes are the AMA's CPT Consumer Friendly Descriptors as published by CMS in the Medicare Physician & Other Practitioners โ by Provider and Service data, 2017โ2018; they are plain-language summaries, not for clinical coding or documentation. HCPCS Level II codes and descriptions are from CMS. Fee schedules, relative value units, conversion factors and/or related components are not assigned by the AMA, are not part of CPT, and the AMA is not recommending their use. The AMA does not directly or indirectly practice medicine or dispense medical services. The AMA assumes no liability for data contained or not contained herein.
| HCPCS Code | Services | Patients | Submitted Charge | Medicare Allowed |
|---|---|---|---|---|
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99222
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes
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51 | 46 | $349.93 | $127.69 |
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99203
New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more
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24 | 24 | $282.70 | $102.13 |
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99213
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more
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22 | 17 | $191.98 | $69.23 |
Source: CMS Part B by Provider and Service, 2018; services under 11 beneficiaries omitted by CMS. Privacy limits
Submitted charges are billed amounts, not a price quote for your visit.
Medicare Part D Prescribing Profile & Medications
Medicare Part D prescriptions filled, including refills, in 2024.
| Brand Name | Generic Name | Prescriptions | Day Supply | Total Cost | Patients |
|---|---|---|---|---|---|
| Hydrocodone-Acetaminophen | Hydrocodone/Acetaminophen | 30 | 163 | $307.46 | 17 |
| Tramadol Hcl | Tramadol Hcl | 22 | 236 | $146.92 | 17 |
| Metronidazole | Metronidazole | 13 | 193 | $143.51 | โ |
| Nitro-Bid | Nitroglycerin | 12 | 330 | $149.39 | โ |
Source: CMS Part D by Provider and Drug, 2024; rows below 11 claims omitted by CMS; volume isn’t quality. Privacy limits
Specialties & License Numbers Reported to NPPES
NUCC Taxonomy Code: 208600000X
A general surgeon has expertise related to the diagnosis - preoperative, operative and postoperative management - and management of complications of surgical conditions in the following areas: alimentary tract; abdomen; breast, skin and soft tissue; endocrine system; head and neck surgery; pediatric surgery; surgical critical care; surgical oncology; trauma and burns; and vascular surgery. General surgeons increasingly provide care through the use of minimally invasive and endoscopic techniques. Many general surgeons also possess expertise in transplantation surgery, plastic surgery and cardiothoracic surgery.
NUCC Taxonomy Code: 208C00000X
A colon and rectal surgeon is trained to diagnose and treat various diseases of the intestinal tract, colon, rectum, anal canal and perianal area by medical and surgical means. This specialist also deals with other organs and tissues (such as the liver, urinary and female reproductive system) involved with primary intestinal disease.
Medicare (PECOS) Enrollment & Ordering Eligibility
Source: CMS PECOSPRACTITIONER - COLORECTAL SURGERY (PROCTOLOGY)
I20140923000047
CA
4284877267
Sources: CMS Provider Enrollment and Order and Referring. Medicare enrollment is a billing status, not an accreditation or quality rating.
Medicare Group Practice Enrollments
Source: CMS Doctors and Clinicians National Downloadable File
Southern California Permanente Medical Group
6640 Alton Pkwy, Irvine, CA 926183734
Phone: 9499325000
Clinicians Sharing This Practice Address or Phone
Clinicians sharing this NPPES address, phone or fax; a shared contact does not mean they work together.
Surgery
Doctor of Medicine (M.D.)
Surgery
Doctor of Medicine (M.D.)
Physician Assistant - Surgical
Physician Assistant (Certified)
Surgery - Vascular Surgery
Doctor of Medicine (M.D.)
Surgery
Doctor of Medicine (M.D.)
Surgery
Doctor of Medicine (M.D.)
Career & Practice History Timeline
Changes recorded in monthly NPPES data files: addresses, names, credentials, specialties and NPI status
Colon & Rectal Surgery (license number reported to NPPES: UT 8505128-1205)
NPI status registered as active in NPPES database
Registered at 3660 PARK SIERRA DR, SUITE 105, RIVERSIDE, CA 925053081 (Tel: 9512788870)
Registered at PO BOX 2828, CORONA, CA 928782828 (Tel: 9512788870)
Recorded as ERIC CHANGCHIEN, MD
Surgery (license number reported to NPPES: CA 108490)
First registered as active Individual Practitioner in NPPES Database.
NPI Administrative Meta
Other Surgery Specialists in Riverside
- Dr. Dahlia Tawfik-Sexton, MD
- Dr. John Coon, MD
- Dr. Hakan Wahlstrom, MD
- Dr. Nicholas Zekos, MD
- Dr. Oscar Garcia, MD
- Dr. Kambiz Zainabadi, MD
Mailing Address
Po Box 2828
Corona, CA 928782828
Phone: 9512788870