Medicare Enrolled
Dr. Timothy Chang, MD
MOHS-Micrographic Surgery Physician · La Jolla, CA
Practice pattern: Clinical Cardiology
— Primarily office-based clinical cardiology
Low-engagement
Very High
DATA COVERAGE
Data in 4 of 4 federal sources
Measures public federal data availability — not provider quality
Informational, not a quality rating.
This page presents federal public records about Dr. Chang from CMS (NPPES, Open Payments, Medicare Provider Utilization, PECOS). It is not medical advice, an endorsement, or a judgment of clinical quality. Always consult the provider directly and a licensed clinician for medical decisions. Read methodology →
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What this data tells you about Dr. Chang
Dr. Timothy Chang is a mohs-micrographic surgery physician in La Jolla, CA, with 13 years of NPI registration. Based on federal Medicare data, Dr. Chang performed 5,401 Medicare services across 2,662 unique beneficiaries.
Between the years covered by Open Payments, Dr. Chang received a total of $8,605 from 35 pharmaceutical and/or device companies across 424 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common in mohs-micrographic surgery physician. Most payments are for meals and travel — low-value interactions common across virtually all practicing physicians. Patients may wish to discuss these relationships with their provider.
The Data Coverage level for Dr. Chang is Very High — reflecting how much public federal data is available about this provider. Patients are encouraged to use this data as one of several factors when choosing a healthcare provider.
✓ 13 years in practice
▲ Top 33% volume in CA
$8,605 industry payments
Medicare Practice Summary
Medicare Utilization ↗5,401
Medicare services
Top 33% in CA for mohs-micrographic surgery physician
2,662
Unique beneficiaries
$108
Avg. Medicare payment
Medicare patients only (65+ / disabled) · How to read this →
~415 Medicare services per year of practice
Top procedures by volume
Ranked by number of services performed for Medicare patients. Avg. submitted charge is what the provider billed; avg. Medicare payment is what CMS paid.
| Procedure | Volume | Avg. paid | Avg. submitted |
|---|---|---|---|
| Destruction of precancerous skin growths, 2-14 This procedure involves the removal or destruction of two to fourteen precancerous skin lesions. It is performed to eliminate abnormal skin cells that have the potential to develop into cancer. |
1,755 | $6 | $24 |
| Office visit, established patient (20-29 min) An office visit for an existing patient lasting between 20 and 29 minutes. The visit involves medical evaluation and management of the patient's condition. |
683 | $70 | $123 |
| Destruction of precancerous skin growth, 1 Removal of a single precancerous skin growth. This procedure destroys abnormal skin cells to prevent them from developing into cancer. |
665 | $44 | $123 |
| Tissue pathology examination, moderate complexity A laboratory test where a pathologist examines tissue samples under a microscope to analyze cellular details. This intermediate complexity procedure involves specialized techniques to identify abnormalities in the tissue. |
296 | $31 | $141 |
| Skin growth removal and lab exam, 1-5 blocks This procedure involves the removal of a growth from the head, neck, hands, feet, or genitals. The removed tissue is then examined under a microscope in the laboratory. |
277 | $462 | $1,046 |
| Destruction of skin growths (warts/lesions), 1-14 This procedure involves the removal or destruction of one to fourteen skin growths. It is a minor surgical intervention performed on the skin surface. |
273 | $93 | $181 |
| Skin biopsy, tangential A procedure to remove a sample of the first identified skin growth for laboratory examination. |
241 | $71 | $173 |
| Removal and microscopic exam of growth of head, neck, hands, feet, or genitals, each additional stage, 1-5 tissue blocks | 206 | $368 | $618 |
| Office visit, established patient (30-39 min) A follow-up office visit for an existing patient lasting between 30 and 39 minutes. The visit involves medical evaluation and management of the patient's condition. |
184 | $98 | $172 |
| Skin growth removal and lab exam, 1-5 blocks A procedure to remove a growth from the trunk, arms, or legs and send 1 to 5 tissue samples to a laboratory for microscopic examination. |
101 | $528 | $970 |
| Complicated wound repair, scalp/arms/legs, 2.6-7.5 cm A complex surgical procedure to close a wound on the scalp, arms, or legs that measures between 2.6 and 7.5 centimeters in length. |
91 | $221 | $1,037 |
| New patient office visit (30-44 min) An initial office visit for a new patient lasting between 30 and 44 minutes. This code is used when the total time spent on the date of the encounter falls within this range. |
65 | $84 | $173 |
| Complex wound repair, 1.1-2.5 cm A surgical procedure to close a complex wound measuring between 1.1 and 2.5 centimeters on areas such as the face, neck, hands, or feet. |
59 | $181 | $559 |
| Office visit, established patient (10-19 min) An office visit for an existing patient lasting 10 to 19 minutes. The visit involves medical evaluation and management of the patient's condition. |
58 | $45 | $74 |
| Skin graft repair of eyelid, nose, ear, or lip, 10 sq cm or less A surgical procedure to repair a wound on the eyelid, nose, ear, or lip by transferring a small piece of skin. The transferred skin covers an area of 10 square centimeters or less. |
54 | $634 | $1,889 |
| Complicated wound repair, 2.6-7.5 cm A complex surgical procedure to close a wound measuring between 2.6 and 7.5 centimeters on areas such as the face, neck, hands, or feet. |
52 | $209 | $683 |
| Additional skin growth biopsy Removal of a sample of an additional skin growth for laboratory examination. This code is used for each extra lesion biopsied during the same session. |
45 | $43 | $79 |
| Skin graft repair, 10 sq cm or less A surgical procedure to repair a wound by transferring a small piece of skin to the affected area. The graft covers wounds on the face, neck, hands, feet, or other specified body parts. |
45 | $618 | $1,203 |
| Destruction of 15 or more precancerous skin growths This procedure involves the removal or destruction of fifteen or more precancerous skin lesions. It is performed to treat abnormal skin cells that have the potential to develop into cancer. |
39 | $137 | $331 |
| New patient office visit (45-59 min) An initial office visit for a new patient lasting between 45 and 59 minutes. This code covers the total time spent by the physician or qualified healthcare professional on the date of the encounter. |
37 | $138 | $264 |
| Complicated wound repair, scalp/arms/legs, 1.1-2.5 cm A complex surgical procedure to close a wound on the scalp, arms, or legs that measures between 1.1 and 2.5 centimeters. |
29 | $159 | $782 |
| Additional Mohs surgery stage with microscopic exam This procedure involves the removal and microscopic examination of an additional stage of tissue from the trunk, arms, or legs. It is performed in stages to ensure complete removal of the growth. |
29 | $353 | $928 |
| Surgical removal of skin cancer, 1.1-2.0 cm Surgical excision of a cancerous skin growth measuring between 1.1 and 2.0 centimeters on the body, arms, or legs. |
19 | $109 | $396 |
| Complicated wound repair of trunk, 2.6-7.5 cm A surgical procedure to close a complex wound on the trunk that measures between 2.6 and 7.5 centimeters in length. |
16 | $255 | $580 |
| Skin graft repair, 10.1-30 sq cm A surgical procedure to repair wounds on the forehead, cheeks, chin, mouth, neck, underarms, genitals, hands, or feet by transferring skin. The graft covers an area between 10.1 and 30.0 square centimeters. |
15 | $616 | $1,416 |
| Full thickness skin graft to nose, ears, eyelids, or lips, 20 sq cm or less A surgical procedure where a full layer of skin is taken from a donor site and transplanted to the nose, ears, eyelids, or lips. The graft covers an area of 20 square centimeters or less. |
15 | $871 | $2,408 |
| Steroid injection (triamcinolone) A 10 mg injection of triamcinolone acetonide, a corticosteroid medication. This code specifies the drug and dosage administered. |
15 | $1 | $22 |
| Punch biopsy of first skin growth A small, circular piece of skin is removed from a skin growth using a circular blade. The sample is then sent to a laboratory for examination. |
13 | $99 | $201 |
| Injection into skin growths, 1-7 A procedure involving the injection of medication into one to seven skin growths. |
13 | $38 | $89 |
| Simple drainage of skin abscess A minor procedure to drain a localized collection of pus from the skin. The abscess is opened to allow the fluid to escape and promote healing. |
11 | $96 | $176 |
How to read this data: This reflects Medicare patients only (typically 65+). Payment amounts are what Medicare paid the provider, not your out-of-pocket cost. A higher procedure volume generally indicates more experience with that procedure.
0.5% high complexity
6.1% medium
93.4% routine
Industry Payment Transparency
Open Payments through 2024 ↗$8,605
Total received (2018-2024)
Avg $1,229/year across 7 years
Top 18% in CA for mohs-micrographic surgery physician
A higher payment rank reflects disclosed industry relationships (consulting, research, speaking) common among subspecialists — not wrongdoing.
35
Companies
424
Individual payments
All payments are legal and publicly reported · Not evidence of wrongdoing · How to interpret →
Payment profile
Industry payments classified by relationship type. Not all payments are equal — research and consulting reflect different relationships than speaking programs or meals.
Meals & Travel
Food, beverages, travel, and lodging — typically low-value
$8,037 (93.4%)
Speaking / Promotional
Speaker programs, honoraria, and industry-sponsored educational events
$567 (6.6%)
Payment trend by year
Annual totals from pharmaceutical and medical device companies.
2024
$2,049
2023
$1,155
2022
$1,527
2021
$1,555
2020
$508
2019
$941
2018
$871
Payments by company (2024)
Consulting
Speaking
Meals & Travel
Research
ABBVIE INC.
$338
Regeneron Healthcare Solutions, Inc.
$285
E.R. Squibb & Sons, L.L.C.
$277
PFIZER INC.
$230
Janssen Biotech, Inc.
$150
Amgen Inc.
$142
Arcutis Biotherapeutics, Inc.
$131
SUN PHARMACEUTICAL INDUSTRIES INC.
$116
Incyte Corporation
$101
LEO Pharma Inc.
$85
UCB, Inc.
$75
Novartis Pharmaceuticals Corporation
$31
Galderma Laboratories, L.P.
$27
Lilly USA, LLC
$25
Boehringer Ingelheim Pharmaceuticals, Inc.
$19
Ortho Dermatologics, a division of Bausch Health US, LLC
$17
Top 3 companies account for 43.9% of 2024 payments
All-time payments by company (2018-2024) ›
PFIZER INC.
$1,023
Janssen Biotech, Inc.
$884
Regeneron Healthcare Solutions, Inc.
$713
LEO Pharma Inc.
$653
ABBVIE INC.
$563
Ortho Dermatologics, a division of Bausch Health US, LLC
$557
Lilly USA, LLC
$445
Incyte Corporation
$356
E.R. Squibb & Sons, L.L.C.
$325
Sun Pharmaceutical Industries Inc.
$283
Arcutis Biotherapeutics, Inc.
$264
Amgen Inc.
$250
AbbVie Inc.
$240
SUN PHARMACEUTICAL INDUSTRIES INC.
$235
Galderma Laboratories, L.P.
$218
Almirall LLC
$201
GENZYME CORPORATION
$191
UCB, Inc.
$153
SANOFI-AVENTIS U.S. LLC
$142
AbbVie, Inc.
$135
Novartis Pharmaceuticals Corporation
$135
VYNE Pharmaceuticals Inc.
$130
Regeneron Pharmaceuticals, Inc.
$126
Merz North America, Inc.
$102
DERMIRA, INC.
$100
Allergan Inc.
$31
Celgene Corporation
$25
DUSA Pharmaceuticals, Inc.
$20
Apyx Medical Corporation
$20
Boehringer Ingelheim Pharmaceuticals, Inc.
$19
Merck Sharp & Dohme Corporation
$19
Misonix Inc
$15
Sandoz Inc.
$15
Novum Pharma, LLC
$14
Biofrontera Inc.
$4
Top 3 companies account for 30.5% of all-time payments
Associated products mentioned in payments ›
ABSORICA LD · ADBRY · AKLIEF · ALTRENO · AMZEEQ · APEXICON E · ARAZLO · Absorica LD · Alcortin A · Ameluz · BLU-U · BOTOX COSMETIC · BRYHALI · Bimzelx · CIBINQO · COSENTYX · Cabtreo · Cimzia · DUOBRII · DUPIXENT · DUPIXENT DUPILUMAB INJECTION · EBGLYSS · ENSTILAR · EUCRISA · HUMIRA · Humira · ILUMYA · ILUMYA (tildrakizumab-asmn) injection · Ilumya · JUBLIA · Klisyri · LEVULAN KERASTICK · LIBTAYO · ONEXTON · OPZELURA · Odomzo · Otezla · QBREXZA · REMICADE · RETIN-A · RETIN-A-MICRO · RINVOQ · SILIQ · SIVEXTRO · SKYRIZI · SOOLANTRA · SPEVIGO · Seysara · Sotyktu · TALTZ · TREMFYA · Tremfya · Winlevi · ZILXI · Zoryve
Should you be concerned? Payments from pharmaceutical and device companies are legal and common — 57% of U.S. physicians receive at least one. They often reflect legitimate consulting, research, or education. What matters is whether a recommended drug or device appears in your doctor's payment records. If so, consider asking your doctor about it. How to interpret this data →
Most payments (93%) are for meals and travel — low-value interactions that are common across virtually all practicing physicians.
Geographic Context
Mohs-micrographic surgery physicians within 10 mi
26
Per 100K population
0.8
County median income
$102,285
Nearest hospital
SCRIPPS MEMORIAL HOSPITAL LA JOLLA
0.0 mi
0.0 mi
Data Sources
| Provider Registry | ✓ NPPES | Weekly updates |
| Medicare Enrollment | ✓ PECOS | Monthly updates |
| Practice Data | ✓ Medicare Util. | Annual (CY lag) |
| Industry Payments | ✓ Open Payments | CY 2024 |
| Disciplinary History | — Not public | N/A |
This provider has data in 4 of 4 available federal datasets, with a Data Coverage level of Very High. This reflects how much public data is available about a provider. How we calculate this →
Summary
Dr. Chang is a clinical cardiology specialist, with moderate Medicare volume, with low-engagement industry engagement in the top 18% of CA peers.
This summary is auto-generated from federal data, describing data availability and patterns. Read our methodology →
Frequently Asked Questions
Is Dr. Chang experienced with destruction of precancerous skin growths, 2-14?
Based on Medicare claims data, Dr. Chang performed 1,755 destruction of precancerous skin growths, 2-14 services. Research suggests that higher procedure volume is often associated with better outcomes, particularly for complex procedures. Note that Medicare data only captures patients aged 65 and older, so the total practice volume across all patients is likely higher.
Does Dr. Chang receive payments from pharmaceutical companies?
Yes. Dr. Chang received a total of $8,605 from 35 companies across 424 individual payments. These payments are legal, publicly disclosed under the federal Sunshine Act, and common among physicians — 57% of all U.S. physicians receive at least one industry payment. Patients may wish to ask their doctor about these relationships, especially if a recommended drug or device appears in the payment records.
How do Dr. Chang's costs compare to other mohs-micrographic surgery physicians in La Jolla?
Dr. Chang's average Medicare payment per service is $108. Note that these figures represent what Medicare pays, not your out-of-pocket cost, which depends on your specific insurance plan and deductible. Procedure-level data above shows both what was submitted and what Medicare paid for each service type.
What does Data Coverage mean?
Data Coverage (currently Very High for Dr. Chang) measures how much public federal data is available about a provider. It is not a quality rating. A "Very High" or "High" level means the provider has data across multiple federal sources (NPPES, PECOS, Medicare Utilization, Open Payments), indicating a long track record of practice, Medicare participation, and industry disclosure. A "Low" or "Moderate" level may simply mean the provider is newer, does not see Medicare patients, or has not received any industry payments — none of which are inherently negative. Read our full methodology →
Is this data up to date?
Each data source has its own update cycle. Provider registry data (NPPES) is updated weekly. Medicare enrollment (PECOS) is updated monthly. Medicare practice data has a ~2 year lag — the most recent available is typically 2 years prior. Industry payment data (Open Payments) is published annually, usually in June, covering the prior calendar year. We display the data date prominently on each section so you always know how current it is. See our data freshness policy →
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About this page
All data on this page is sourced verbatim from public federal records published by the U.S. Centers for Medicare & Medicaid Services (CMS): NPPES ↗, Open Payments ↗, Medicare Provider Utilization ↗, and PECOS. Publication is mandated by the Physician Payments Sunshine Act (§6002 ACA, 42 U.S.C. §1320a-7h) and the Freedom of Information Act.
This page is not medical advice, an endorsement, a recommendation, or a quality rating. Data Coverage reflects data completeness — how much federal information exists for this provider — not clinical performance, patient outcomes, or quality of care. Always verify information directly with the provider and consult a licensed clinician before making medical decisions.
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