NPI registry status
Active
2026 NPPES data Pain Medicine (Physical Medicine & Rehabilitation) Physician NPI 1205934262 D.O.
Verify on CMS → Michael Chang, D.O.
Pain Medicine (Physical Medicine & Rehabilitation) Physician in Walnut Creek, California.
This profile is drawn from the federal National Provider Identifier Registry (CMS NPPES), which lists more than 7 million U.S. healthcare providers - including 1,661 in Pain Medicine (Physical Medicine & Rehabilitation) Physician, and covers specialty classification, practice address, and Medicare Part D prescribing data when reported. According to CMS, every field reflects the provider's official federal registration, see our methodology.
Federal data, no proprietary rating.
We show these CMS records as-is - no composite score, no star rating, no editorial opinion layered on top.
Prescribing volume
396
Medicare Part D claims · 180 beneficiaries · Pain Medicine (Physical Medicine & Rehabilitation) Physician avg: 1K
MIPS score
75/100
CMS neutral threshold · no category scores published
Industry payments
$90.75
2 payments · CMS Open Payments (Sunshine Act)
What the federal data shows
Michael Chang, D.O. carries the neutral CMS MIPS final score of 75/100, assigned where no category was scored - and filed 396 Medicare Part D claims in 2024.
- 75/100
- CMS neutral score · not measured
- 396
- Part D claims, 2024
- Likely
- board-certified (heuristic)
- ≥56th
- pct by Part D claim volume (lower-bound band)
Every figure on this page comes straight from federal CMS records (NPPES, Medicare Part D, MIPS, Open Payments) - no proprietary rating or editorial opinion is applied.
Federal trust snapshot
What official records show about Michael Chang, D.O.
Federal records show an active NPI with Medicare Part D prescribing activity — verifiable registry data, not a proprietary rating.
- Verified
NPI registry status
Active listing in the CMS National Provider Identifier Registry (NPI 1205934262), first enumerated 09/20/2006.
Source: CMS NPPES
- Reported
Medicare Part D participation
Filed 396 Medicare Part D prescription claims in the 2023 CMS public use file — indicates active Medicare prescribing participation.
Source: CMS Part D Prescriber PUF
- Reported
CMS quality reporting (MIPS)
CMS assigned a neutral MIPS final score of 75/100 where no performance category was scored — not a measured quality rank.
Source: CMS Quality Payment Program
- Reported
Board certification signal
Heuristic suggests board-certified status based on ABMS-eligible specialty taxonomy plus active CMS participation signals — not a direct ABMS verification.
- Reported
Hospital affiliations
1 CMS Care Compare hospital affiliation on record — practice footprint from the Doctors and Clinicians file.
Source: CMS Care Compare
- Reported
Industry payment transparency
$90.75 in reported industry payments (2 transfers) in 2024 under the federal Sunshine Act — disclosed transfers of value, not a quality rating.
Source: CMS Open Payments
- State context
State board disciplinary context
California statewide board action statistics are published annually — these figures describe aggregate state activity, not Michael Chang, D.O.'s individual license status. Verify directly with the state medical board.
Source: MBC annual report 2023
- Not in federal data
Individual sanction lookup
PlainDoctor does not publish per-provider disciplinary determinations. Confirm current license and any individual actions through the state medical board or FSMB verification service.
Source: State medical board / FSMB
This trust snapshot summarizes only what appears in federal CMS/NPPES public records. It is not a composite score, star rating, patient review, or clinical recommendation. PlainDoctor never fabricates reviews or AggregateRating schema.
CMS NPPES provider registry desk
NPI 1205934262 · Pain Medicine (Physical Medicine & Rehabilitation) Physician
NPI-10 · ENUM-LEGACY · TAX-NARROW · MIPS-NEUTRAL · RX-LIGHT · BOOK-THIN · PHOTO-ENUM
- NPI-10 1205934262
- ENUM-LEGACY 2006
- TAX-NARROW 1,661
- MIPS-NEUTRAL 75/100
- RX-LIGHT 396
- BOOK-THIN 245 in California
- PHOTO-ENUM Youssef Wassef, M.D.… · 2006
Michael Chang, D.O.'s Medicare Part D volume vs every U.S. prescriber
Total Medicare Part D claims, 2024, across all CMS prescribers nationally
396 ≥ 56th percentile 56% of 1,416,883 prescribers are in lower value bands
Each bar is a band; taller bars hold more prescribers. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count, share, and where it sits relative to this entry.
The percentile is a conservative 100-claim band: it counts only prescribers in lower claim-volume bands. Medicare Part D claim volume is activity context, not a quality measure or recommendation. See methodology § corpus placement.
Source CMS Medicare Part D Prescriber Public Use File · 2024
✓
Board certification likely (heuristic, not verified)
Michael Chang, D.O. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting + 1 hospital affiliation - signals consistent with board-certified status. For verified board certification, see CertificationMatters.org (the official ABMS public lookup).
What does the federal data show about Michael Chang, D.O.?
CMS neutral score, not measuredPrimary specialty
Pain Medicine (Physical Medicine & Rehabilitation) Physician
Medicare Part D claims
396 72% vs specialty avg
MIPS final score
75/100
Specialty distribution in California
How Pain Medicine (Physical Medicine & Rehabilitation) Physician compares to other specialties among California providers
MIPS score not measured
CMS assigned a neutral 75/100 threshold
CMS did not publish any Quality, Cost, Promoting Interoperability, or Improvement Activities category score for this clinician. This administrative threshold is not comparable with the national average of clinicians whose MIPS score was measured.
How MIPS and board certification work
The Merit-based Incentive Payment System (MIPS) scores providers 0–100 across four performance categories: Quality, Cost, Promoting Interoperability, and Improvement Activities, weighted under 42 CFR §414.1380. Reporting is voluntary for many small practices, so absence of a MIPS score is not a quality signal.
Board certification through an ABMS or AOA member board signals voluntary post-licensure examination plus continuous Maintenance of Certification cycles. Verify any individual provider's status through certificationmatters.org (ABMS) or osteopathic.org (AOA).
Practice Address
Provider Details
| NPI | 1205934262 |
|---|---|
| Specialty | Pain Medicine (Physical Medicine & Rehabilitation) Physician |
| Credentials | D.O. |
| Gender | Male |
| NPI Issued | 09/20/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
75
Final Score
CMS neutral threshold · not measured
Reporting: Group practice
Hospital and facility affiliations
Facilities where Michael Chang, D.O. bills Medicare from. Star ratings (1-5) are CMS Hospital Compare's "Hospital overall rating" - a composite of mortality, readmission, patient experience, safety, timely care, and efficient use of medical imaging measures. Source: CMS Care Compare.
Golden State Orthopedics And Spine
Brentwood, CA
Affiliations sourced from CMS Doctors and Clinicians National Downloadable File; hospital ratings from CMS Hospital General Information dataset (cross-referenced by facility name + state).
Industry payments received (2024) - CMS Open Payments transparency data
The federal Physician Payments Sunshine Act (part of the Affordable Care Act) requires drug and medical-device manufacturers + group purchasing organizations to publicly report payments and other transfers of value to physicians and teaching hospitals. The data below covers 2024 for Michael Chang, D.O.. Source: openpaymentsdata.cms.gov.
Total received
$91
Largest payer
Saluda Medical Americas, Inc.
Most common payment type
Food and Beverage
Industry payments are not necessarily indicators of bias, they include research funding, consulting fees for evidence-based work, royalties for inventions, food at conferences, and similar items. The disclosure exists for transparency. Read our methodology for how we interpret this data.
License & disciplinary context - California MBC 2023 annual report
Aggregate state board data only, NOT a determination of any individual provider's status. The figures below describe statewide disciplinary activity across all ~150K California medical licensees in 2023 - they are NOT specific to Michael Chang, D.O.. To verify Michael Chang, D.O.'s current license status, search the MBC public license lookup directly, or check the Federation of State Medical Boards (FSMB) verification service.
576
Total board actions, California 2023
Across 556 cases
3.84
Actions per 1,000 licensees
California statewide rate
probation
Most common action type
186 cases
MBC publishes annual disciplinary statistics as part of public-record reporting under each state's Administrative Procedure Act. See the full breakdown by action type and year on the California disciplinary trends page. Cross-checked against FSMB U.S. Medical Regulatory Trends.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2024.
396
Total Claims
$4K
Total Drug Cost
180
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 448.133
- Total Day Supply
- 8,145
- Generic Drug Cost
- $3K
- Opioid Claims
- 37 (9.3% rate)
Patient Demographics
- Average Patient Age
- 75.2 years
- Avg HCC Risk Score
- 1.05
- Gender Split
- 65% female / 35% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2024. Based on Medicare Part D data only.
What Michael Chang, D.O. prescribes most
Top Medicare Part D drugs by claim count, 2024
- Baclofen
Baclofen
146 claims
- Gabapentin
Gabapentin
79 claims
- Diazepam 32
Diazepam
32 claims
- Celecoxib 22
Celecoxib
22 claims
- Meloxicam 19
Meloxicam
19 claims
- Ibuprofen 17
Ibuprofen
17 claims
- Cyclobenzaprine Hcl 13
Cyclobenzaprine Hcl
13 claims
- Hydrocodone-Acetam… 13
Hydrocodone-Acetaminophen
13 claims
| Drug | Claims |
|---|---|
| Baclofen | 146 |
| Gabapentin | 79 |
| Diazepam | 32 |
| Celecoxib | 22 |
| Meloxicam | 19 |
| Ibuprofen | 17 |
| Cyclobenzaprine Hcl | 13 |
| Hydrocodone-Acetaminophen Hydrocodone/Acetaminophen | 13 |
| Methylprednisolone | 13 |
| Tramadol Hcl | 13 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Pain Medicine (Physical Medicine & Rehabilitation) Physician in CA →
All providers in California →
Compare specialties →
Pain Medicine (Physical Medicine & Rehabilitation) Physician Overview
How Michael Chang, D.O. fits within the Pain Medicine (Physical Medicine & Rehabilitation) Physician landscape nationally.
1,661
Pain Medicine (Physical Medicine & Rehabilitation) Physician Providers in US
51
States with Pain Medicine (Physical Medicine & Rehabilitation) Physician
1,399
Avg Claims per Provider
Michael Chang, D.O.'s 396 claims are below the specialty average of 1,399.
Nationwide Pain Medicine (Physical Medicine & Rehabilitation) Physician peers with similar MIPS or enrollment year
Two federal-record peer sets for Chang, both outside California so the neighborhoods are not geographic containment.
Similar MIPS final score
Nearest same-specialty clinicians by CMS MIPS final score (75 here).
Same NPPES enumeration year (2006)
Same-specialty clinicians who entered the NPI registry in the same calendar year, outside this state.
Nearby Pain Medicine (Physical Medicine & Rehabilitation) Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Chang.
One of 245 Pain Medicine (Physical Medicine & Rehabilitation) Physician providers enrolled in California, 5 are shown here.
Frequently Asked Questions
What is Michael Chang, D.O.'s specialty? ▼
Michael Chang, D.O. specializes in Pain Medicine (Physical Medicine & Rehabilitation) Physician and practices in Walnut Creek, California. Credentials: D.O..
How much does Michael Chang, D.O. prescribe under Medicare Part D? ▼
In 2024, Michael Chang, D.O. wrote 396 Medicare Part D claims totaling $4K in drug costs for 180 beneficiaries.
What is Michael Chang, D.O.'s Medicare quality score? ▼
Michael Chang, D.O. has a CMS MIPS Final Score of 75/100. CMS published no Quality, Promoting Interoperability, Improvement Activity or Cost score for this clinician, so the final score is the neutral performance threshold CMS assigns rather than a measured result. The average MIPS Final Score across the 454,083 clinicians with at least one published category score is 83.5; clinicians whose score CMS assigned without scoring any category are excluded from that average. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Michael Chang, D.O. located? ▼
Michael Chang, D.O. is located at 2405 SHADELANDS DR, Walnut Creek, CA, 94598. Phone: (925) 939-8585.
What is Michael Chang, D.O.'s NPI number? ▼
Michael Chang, D.O.'s National Provider Identifier (NPI) is 1205934262, issued on 09/20/2006.
Does Michael Chang, D.O. prescribe opioids? ▼
Yes, Michael Chang, D.O. had 37 opioid claims in 2024 with an opioid prescribing rate of 9.3%.
How many Pain Medicine (Physical Medicine & Rehabilitation) Physician providers are there in the US? ▼
There are 1,661 Pain Medicine (Physical Medicine & Rehabilitation) Physician providers across 51 states in the US. The average Pain Medicine (Physical Medicine & Rehabilitation) Physician provider writes 1,399 Medicare Part D claims per year.
What drugs does Michael Chang, D.O. prescribe most often? ▼
Based on 2024 Medicare Part D data, Michael Chang, D.O.'s most frequently prescribed drugs include Baclofen, Gabapentin, Diazepam. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Michael Chang, D.O. accept Medicare? ▼
Michael Chang, D.O. appears in CMS Medicare data with 396 Part D claims and 180 Medicare beneficiaries in 2024. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Michael Chang, D.O.'s credentials? ▼
Michael Chang, D.O.'s NPI is 1205934262 with credentials D.O.. You can verify this through the NPPES NPI Registry, check state medical board records, and confirm board certification through the ABMS or AOA.
Data Sources
View source datasets and methodology notes
- Provider Directory
- CMS National Plan and Provider Enumeration System (NPPES), download.cms.gov/nppes, updated monthly. Contains NPI, specialty, credentials, and practice location.
- Specialty Classification
- NUCC Health Care Provider Taxonomy (nucc.org), the industry standard for classifying provider specialties in Medicare and Medicaid billing.
- Prescribing Data
- CMS Medicare Part D Prescriber Public Use File (2024). Includes claims, drug costs, beneficiaries, and opioid prescribing rates.
- Quality Performance
- CMS Merit-based Incentive Payment System (MIPS) - 2023 performance year.
- Limitations
- Provider data is self-reported to CMS. Prescribing data reflects Medicare Part D only and does not include commercial insurance, Medicaid, or cash prescriptions. Claims below 11 beneficiaries are suppressed by CMS for privacy.
See our complete data methodology for details on how we collect and process government data.
Data as of August 2026 (NPPES) / 2024 (Medicare Part D). Source: Centers for Medicare & Medicaid Services (CMS).
Disclaimer: Data from CMS NPPES and Medicare Part D. PlainDoctor does not rate or rank providers. Provider information is self-reported and may not be current. Always verify information directly with the provider. About · Methodology
Every figure on PlainDoctor is rendered directly from the federal CMS NPPES registry, Medicare Part D, MIPS, and Open Payments records, no number is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of August 2026.