NPI registry status
Active
2026 NPPES data Pain Medicine (Anesthesiology) Physician NPI 1366411548 M.D.
Verify on CMS → Gary Chang, M.D.
Pain Medicine (Anesthesiology) Physician in Monterey, 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 4,020 in Pain Medicine (Anesthesiology) 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
147
Medicare Part D claims · 48 beneficiaries · Pain Medicine (Anesthesiology) Physician avg: 2K
MIPS score
0/100
▼ 83 pts below national avg 83.1 · Penalty band
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Gary Chang, M.D. reported a CMS MIPS final score of 0/100 - below the 83.1 national average - and filed 147 Medicare Part D claims in 2023.
- 0/100
- MIPS score · -83 vs avg
- 147
- Part D claims, 2023
- Likely
- board-certified (heuristic)
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.
Gary Chang, M.D.'s MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
0 0th percentile higher than 0% of 477,587 scored providers
Each bar is a band; taller bars hold more scored providers. 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.
Source CMS Merit-based Incentive Payment System (MIPS) · 2023
Where Gary Chang, M.D. sits
This provider among pain medicine (anesthesiology) physician peers
Across the 1,110 pain medicine (anesthesiology) physician providers who report both Medicare Part D prescribing and a MIPS quality score, Gary Chang, M.D. writes more Part D claims than 13% of them and scores higher on MIPS quality than 0% - placing this provider in the lower-volume, lower-quality quadrant. Volume reflects patient-panel size and specialty, not quality; the two axes are independent.
Part D claim volume vs MIPS quality, by specialty percentile
Each dot is one pain medicine (anesthesiology) physician peer from a representative sample of 60; the gold marker is Gary Chang, M.D.. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Gary Chang, M.D. practices in an ABMS-board-eligible specialty and shows active CMS Medicare participation + MIPS quality reporting - 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 Gary Chang, M.D.?
Below national averagePrimary specialty
Pain Medicine (Anesthesiology) Physician
Medicare Part D claims
147 91% vs specialty avg
MIPS final score
0/100 83.1 pts vs avg
Specialty distribution in California
How Pain Medicine (Anesthesiology) Physician compares to other specialties among California providers
Medicare quality performance, MIPS
Gary Chang, M.D.'s 2023 MIPS final score plotted against the Pain Medicine (Anesthesiology) Physician national average
- MIPS Final Score
- 0/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (Pain Medicine (Anesthesiology) Physician) - 0/100 vs national avg 83.1
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).
Gary Chang, M.D. appears in the CMS NPPES registry as a Pain Medicine (Anesthesiology) Physician provider holding M.D. credentials at 12 UPPER RAGSDALE DR, Monterey, CA, 93940, with a listed phone of (831) 648-7200. NPI 1366411548 was issued on 03/17/2006.
Medicare Part D records for calendar year 2023 show 147 prescription claims written by this provider, covering 48 Medicare beneficiaries and totaling roughly $3K in drug spend. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 0/100 for the 2023 performance year (Quality 0), compared with the national average of 83.1.
Pain Medicine (Anesthesiology) Physician is a narrow specialty nationwide, with 4,020 enrolled providers across 53 states and an average of 1,657 Part D claims per prescriber, so the context for interpreting these metrics differs meaningfully from a primary-care baseline.
Important: PlainDoctor is a directory of publicly available government data, not medical advice, a malpractice database, or a quality rating. Inclusion here does not imply a recommendation, and absence of complaints or sanctions on this page does not mean none exist, always verify credentials through the NPPES NPI Registry, your state medical board, and the ABMS or AOA before making healthcare decisions.
Practice Address
Provider Details
| NPI | 1366411548 |
|---|---|
| Specialty | Pain Medicine (Anesthesiology) Physician |
| Credentials | M.D. |
| Gender | Male |
| NPI Issued | 03/17/2006 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
0
Final Score
Avg: 83.1
0
Quality
0
Promoting Interoperability
Reporting: Individual
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 Gary Chang, M.D.. To verify Gary Chang, M.D.'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 2023.
147
Total Claims
$3K
Total Drug Cost
48
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 158
- Total Day Supply
- 4,444
- Generic Drug Cost
- $3K
Patient Demographics
- Average Patient Age
- 72.9 years
- Avg HCC Risk Score
- 1.08
- Gender Split
- 60% female / 40% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
| Drug | Claims |
|---|---|
| Gabapentin | 77 |
| Meloxicam | 15 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More Pain Medicine (Anesthesiology) Physician in CA →
All providers in California →
Compare specialties →
Pain Medicine (Anesthesiology) Physician Overview
How Gary Chang, M.D. fits within the Pain Medicine (Anesthesiology) Physician landscape nationally.
4,020
Pain Medicine (Anesthesiology) Physician Providers in US
53
States with Pain Medicine (Anesthesiology) Physician
1,657
Avg Claims per Provider
Gary Chang, M.D.'s 147 claims are below the specialty average of 1,657.
Nearby Pain Medicine (Anesthesiology) Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Chang.
Dr. Shahram Abbassi
MD
Arcata, CA
Dr. Chris Abrecht
M.D.
San Francisco, CA
Dr. Rishi Agarwal
M.D.
Pasadena, CA
Dr. Bashar Ahmed
M.D.
Santa Rosa, CA
Dr. Jane Ahn
M.D.
Stanford, CA
Compare Pain Medicine (Anesthesiology) Physician nationally: see state-by-state distribution →
Before you book an appointment
Use this federal record as your verification checklist, not as a recommendation.
- Confirm the NPI record is current in the official CMS registry, providers update their own NPPES details, and moves can lag. Verify this NPI
- Check the active license and any disciplinary history with the California medical board, federal registration is not a license check. Credential verification guide
- Weigh a second option: compare this provider with a nearby Pain Medicine (Anesthesiology) Physician peer on Medicare volume and prescribing patterns. Compare providers
Medicare Part D and MIPS figures describe practice patterns in federal programs only, they are not quality ratings, and PlainDoctor does not rate, rank, or recommend providers.
Healthcare Guides
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Medical Specialties Explained
Who treats what and how specialties differ
Understanding Medicare Claims Data
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How insurance networks affect your costs
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Frequently Asked Questions
What is Gary Chang, M.D.'s specialty? ▼
Gary Chang, M.D. specializes in Pain Medicine (Anesthesiology) Physician and practices in Monterey, California. Credentials: M.D..
How much does Gary Chang, M.D. prescribe under Medicare Part D? ▼
In 2023, Gary Chang, M.D. wrote 147 Medicare Part D claims totaling $3K in drug costs for 48 beneficiaries.
What is Gary Chang, M.D.'s Medicare quality score? ▼
Gary Chang, M.D. has a CMS MIPS Final Score of 0/100 (Quality: 0). The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Gary Chang, M.D. located? ▼
Gary Chang, M.D. is located at 12 UPPER RAGSDALE DR, Monterey, CA, 93940. Phone: (831) 648-7200.
What is Gary Chang, M.D.'s NPI number? ▼
Gary Chang, M.D.'s National Provider Identifier (NPI) is 1366411548, issued on 03/17/2006.
How many Pain Medicine (Anesthesiology) Physician providers are there in the US? ▼
There are 4,020 Pain Medicine (Anesthesiology) Physician providers across 53 states in the US. The average Pain Medicine (Anesthesiology) Physician provider writes 1,657 Medicare Part D claims per year.
What drugs does Gary Chang, M.D. prescribe most often? ▼
Based on 2023 Medicare Part D data, Gary Chang, M.D.'s most frequently prescribed drugs include Gabapentin, Meloxicam. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Gary Chang, M.D. accept Medicare? ▼
Gary Chang, M.D. appears in CMS Medicare data with 147 Part D claims and 48 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Gary Chang, M.D.'s credentials? ▼
Gary Chang, M.D.'s NPI is 1366411548 with credentials M.D.. 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 (2023). 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 April 2026 (NPPES) / 2023 (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
Compiled from official public sources by the PlainDoctor editorial team.