NPI registry status
Active
2026 NPPES data MOHS-Micrographic Surgery Physician NPI 1962766337 MD
Verify on CMS → Timothy Chang, MD
MOHS-Micrographic Surgery Physician in La Jolla, 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 1,102 in MOHS-Micrographic Surgery 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
569
Medicare Part D claims · 237 beneficiaries · MOHS-Micrographic Surgery Physician avg: 607
Generic prescribing
95%
generic claims · 5% brand-name · higher generic rates reduce patient out-of-pocket costs
MIPS score
75/100
▼ 8 pts below national avg 83.1 · Above neutral
Industry payments
$2.0K
86 payments · CMS Open Payments (Sunshine Act)
Source: CMS Medicare Part D Prescriber Public Use File, 2023
Compiled from official public sources by the PlainDoctor editorial team.
What the federal data shows
Timothy Chang, MD reported a CMS MIPS final score of 75/100 - below the 83.1 national average - and filed 569 Medicare Part D claims in 2023.
- 75/100
- MIPS score · -8 vs avg
- 569
- Part D claims, 2023
- 95%
- generic prescribing
- 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.
Timothy Chang, MD's MIPS score vs every scored U.S. clinician
CMS Merit-based Incentive Payment System (MIPS) final score, 2023, the federal quality measure
75 15th percentile higher than 15% 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 Timothy Chang, MD sits
This provider among mohs-micrographic surgery physician peers
Across the 705 mohs-micrographic surgery physician providers who report both Medicare Part D prescribing and a MIPS quality score, Timothy Chang, MD writes more Part D claims than 57% of them and scores higher on MIPS quality than 11% - placing this provider in the high-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 mohs-micrographic surgery physician peer from a representative sample of 60; the gold marker is Timothy Chang, MD. Source: CMS Medicare Part D Prescriber data and the CMS Merit-based Incentive Payment System, 2023.
✓
Board certification likely (heuristic, not verified)
Timothy Chang, MD 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 Timothy Chang, MD?
Below national averagePrimary specialty
MOHS-Micrographic Surgery Physician
Medicare Part D claims
569 6% vs specialty avg
MIPS final score
75/100 8.1 pts vs avg
Specialty distribution in California
How MOHS-Micrographic Surgery Physician compares to other specialties among California providers
Medicare quality performance, MIPS
Timothy Chang, MD's 2023 MIPS final score plotted against the MOHS-Micrographic Surgery Physician national average
- MIPS Final Score
- 75/100
- vs 83.1 national avg · 2023 performance year
MIPS final score (MOHS-Micrographic Surgery Physician) - 75/100 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).
Timothy Chang, MD appears in the CMS NPPES registry as a MOHS-Micrographic Surgery Physician provider holding MD credentials at 9850 GENESEE AVE STE 850, La Jolla, CA, 92037, with a listed phone of (858) 657-0267. NPI 1962766337 was issued on 06/29/2012.
Medicare Part D records for calendar year 2023 show 569 prescription claims written by this provider, covering 237 Medicare beneficiaries and totaling roughly $104K in drug spend, split 5% brand-name and 95% generic by claim count. On the CMS Merit-based Incentive Payment System, this provider earned a Final Score of 75/100 for the 2023 performance year, compared with the national average of 83.1.
MOHS-Micrographic Surgery Physician is a narrow specialty nationwide, with 1,102 enrolled providers across 52 states and an average of 607 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 | 1962766337 |
|---|---|
| Specialty | MOHS-Micrographic Surgery Physician |
| Credentials | MD |
| Gender | Male |
| NPI Issued | 06/29/2012 |
CMS Quality Score (MIPS)
Merit-based Incentive Payment System (MIPS) scores from CMS, 2023 performance year.
75
Final Score
Avg: 83.1
Reporting: Group practice
Hospital and facility affiliations
Facilities where Timothy Chang, MD 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.
Coastal Medical And Cosmetic Dermatology Inc
La Jolla, 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 Timothy Chang, MD. Source: openpaymentsdata.cms.gov.
Total received
$2.0K
Largest payer
ABBVIE 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 Timothy Chang, MD. To verify Timothy Chang, MD'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.
Brand vs generic prescribing mix · Generic-heavy
Timothy Chang, MD - brand share 5.0%
MOHS-Micrographic Surgery Physician average
5% brand-name claims vs 95% generic, on 569 2023 Medicare Part D claims.
The federal Medicare Part D Generic Dispensing Rate national benchmark sits near 90% generic / 10% brand for primary-care prescribers, per CMS Office of the Actuary 2024 estimates. Higher brand share is common in specialty prescribing where generic equivalents are not available.
Medicare Part D Prescribing Data
CMS Medicare Part D prescriber-level data for calendar year 2023.
569
Total Claims
$104K
Total Drug Cost
237
Medicare Beneficiaries
Prescribing Breakdown
- 30-Day Fills
- 663
- Total Day Supply
- 15,380
- Brand vs Generic
- 5% brand / 95% generic
- Brand Drug Cost
- $82K
- Generic Drug Cost
- $22K
- Antibiotic Claims
- 96
Patient Demographics
- Average Patient Age
- 77.6 years
- Avg HCC Risk Score
- 1.16
- Gender Split
- 54% female / 46% male
Top Prescribed Drugs (Medicare Part D)
Top drugs by claim count for calendar year 2023. Based on Medicare Part D data only.
What Timothy Chang, MD prescribes most
Top Medicare Part D drugs by claim count, 2023
- Doxycycline Hyclate
Doxycycline Hyclate
76 claims
- Ketoconazole
Ketoconazole
68 claims
- Triamcinolone Acet…
Triamcinolone Acetonide
55 claims
- Mupirocin
Mupirocin
52 claims
- Clindamycin Phosph… 29
Clindamycin Phosphate
29 claims
- Clobetasol Propion… 27
Clobetasol Propionate
27 claims
- Tacrolimus 24
Tacrolimus
24 claims
- Fluocinonide 23
Fluocinonide
23 claims
| Drug | Claims |
|---|---|
| Doxycycline Hyclate | 76 |
| Ketoconazole | 68 |
| Triamcinolone Acetonide | 55 |
| Mupirocin | 52 |
| Clindamycin Phosphate | 29 |
| Clobetasol Propionate | 27 |
| Tacrolimus | 24 |
| Fluocinonide | 23 |
| Fluorouracil | 23 |
| Valacyclovir Valacyclovir Hcl | 16 |
* Counts below 11 are suppressed by CMS for patient privacy. Generic names shown where available from CMS Part D data.
More MOHS-Micrographic Surgery Physician in CA →
All providers in California →
Compare specialties →
MOHS-Micrographic Surgery Physician Overview
How Timothy Chang, MD fits within the MOHS-Micrographic Surgery Physician landscape nationally.
1,102
MOHS-Micrographic Surgery Physician Providers in US
52
States with MOHS-Micrographic Surgery Physician
607
Avg Claims per Provider
Timothy Chang, MD's 569 claims are below the specialty average of 607.
Nearby MOHS-Micrographic Surgery Physician Providers in California
Other clinicians with the same primary specialty enrolled in California, drawn from the same CMS NPPES roster as Chang.
Dr. Sam Abaza
M.D.
Diamond Bar, CA
Dr. Payam Abrishami
MD
Agoura Hills, CA
Dr. Vince Afsahi
M.D.
Tustin, CA
Dr. Kristen Aguirre
MD
Oceanside, CA
Dr. Ji Won Ahn
MD
Walnut Creek, CA
Compare MOHS-Micrographic Surgery 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 MOHS-Micrographic Surgery 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.
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Frequently Asked Questions
What is Timothy Chang, MD's specialty? ▼
Timothy Chang, MD specializes in MOHS-Micrographic Surgery Physician and practices in La Jolla, California. Credentials: MD.
How much does Timothy Chang, MD prescribe under Medicare Part D? ▼
In 2023, Timothy Chang, MD wrote 569 Medicare Part D claims totaling $104K in drug costs for 237 beneficiaries.
What is Timothy Chang, MD's Medicare quality score? ▼
Timothy Chang, MD has a CMS MIPS Final Score of 75/100. The national average MIPS Final Score is 83.1. Source: CMS Merit-based Incentive Payment System (MIPS) 2023.
Where is Timothy Chang, MD located? ▼
Timothy Chang, MD is located at 9850 GENESEE AVE STE 850, La Jolla, CA, 92037. Phone: (858) 657-0267.
What is Timothy Chang, MD's NPI number? ▼
Timothy Chang, MD's National Provider Identifier (NPI) is 1962766337, issued on 06/29/2012.
Does Timothy Chang, MD prescribe more brand-name or generic drugs? ▼
Timothy Chang, MD's prescribing is 5% brand-name and 95% generic drugs by claim count, with $82K in brand drug costs.
How many MOHS-Micrographic Surgery Physician providers are there in the US? ▼
There are 1,102 MOHS-Micrographic Surgery Physician providers across 52 states in the US. The average MOHS-Micrographic Surgery Physician provider writes 607 Medicare Part D claims per year.
What drugs does Timothy Chang, MD prescribe most often? ▼
Based on 2023 Medicare Part D data, Timothy Chang, MD's most frequently prescribed drugs include Doxycycline Hyclate, Ketoconazole, Triamcinolone Acetonide. This reflects Medicare Part D prescriptions only and does not include commercial insurance or other payer types.
Does Timothy Chang, MD accept Medicare? ▼
Timothy Chang, MD appears in CMS Medicare data with 569 Part D claims and 237 Medicare beneficiaries in 2023. Contact the provider's office directly to confirm current Medicare enrollment and accepted plans.
How can I verify Timothy Chang, MD's credentials? ▼
Timothy Chang, MD's NPI is 1962766337 with credentials MD. 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.