caretrace.iopowered by▸healthparse
SearchCohort Builder
Tools▾
KOL FinderTerritoriesDrug Compare
AI Query
Browse▾
By stateBy specialty
Pricing
SearchCohort BuilderToolsKOL FinderTerritoriesDrug CompareAI QueryBrowseBy stateBy specialtyPricing
PROVIDER PROFILE · NPI 1215931993

Mark WilloughbyM.D.

DermatologyChula Vista, CAI
CROSS-REFERENCE

Related data on other Healthparse brands

ProviderScore
OIG/SAM exclusion screening, sanctions history
© 2026 CareTrace
PricingContactPrivacyTerms
QUALITY · MIPS · 2024
Final MIPS score
100.0
Quality
100.0
Cost
0.0
Improvement activities
40.0
Promoting interop.
0.0
Payment adjustment
1.05%
Individual
INDUSTRY PAYMENTS · OPEN PAYMENTS · 2024
Total received
$1K
Payment records
60
By payment type
Food and Beverage$1K
Education$190
PRESCRIBING · PART D · 2024
Total Rx claims
887
Beneficiaries
—
Total drug cost
$31K
Distinct drugs
17
Brand share
1.7%
Top prescribed drugs
Fluocinonide210 claims
Hydrocortisone117 claims
Clobetasol Propionate110 claims
Triamcinolone Acetonide106 claims
Ketoconazole64 claims
MEDICARE UTILIZATION · PART B · 2024
Total beneficiaries
3,488
Unique beneficiaries
—
Total services
22,529
Distinct HCPCS
24
Medicare payment
$353K
Peer benchmark
Q1
Q2
Q3
Q4
Q5
Total Medicare services vs. 1,546 Dermatology providers in CA — top quintile (cohort median 2,504).
REFERRAL NETWORK

Where Mark Willoughby's patients come from & go

Directional shared-patient flow from Medicare claims — who sends patients to this provider (inbound) and where this provider's patients go next (outbound). 14 inbound referrers · 33 outbound destinations.

Receives referrals from
Inbound — who sends patients here
PhysicianPatientsVisits
Erick Mafong
Dermatology · Chula Vista, CA
172839
NPI 1306849542141760
Unilab Corporation
Clinical Laboratory · West Hills, CA
69135
SHARP CHULA VISTA MEDICAL CENTER69140
SHARP CORONADO HOSPITAL AND HEALTHCARE CENTER37125
David Hansen
Internal Medicine · Chula Vista, CA
37116
David Chang
Family Practice · Chula Vista, CA
2358
SHARP MEMORIAL HOSPITAL2341
Mushrik Kaisey
Internal Medicine · Chula Vista, CA
2278
REGENTS OF THE UNIVERSITY OF CALIFORNIA2070
Aireen Gutierrez
Geriatric Medicine · San Diego, CA
19101
Donna Crowley
Physical Medicine and Rehabilitation · National City, CA
1366
Refers patients to
Outbound — where patients go next
PhysicianPatientsVisits
Pacific Pathology, Inc.
Clinical Laboratory · San Diego, CA
262588
Erick Mafong
Dermatology · Chula Vista, CA
198903
Amy Han
Dermatology · Chula Vista, CA
116736
NPI 130684954278297
SHARP CHULA VISTA MEDICAL CENTER78176
Unilab Corporation
Clinical Laboratory · West Hills, CA
74154
Cole Willoughby
Dermatology · Chula Vista, CA
55322
Laboratory Corporation Of America
Clinical Laboratory · San Diego, CA
51144
SCRIPPS HEALTH5199
Kan-Di-Ki Llc
Portable X-Ray Supplier · North Hollywood, CA
38183
SHARP CORONADO HOSPITAL AND HEALTHCARE CENTER36116
Scripps Health
Clinical Laboratory · San Diego, CA
33118
Source: CMS Physician Shared Patient Patterns (30-day window, Medicare FFS). Direction = a beneficiary seen by the first provider, then the second, within 30 days; a proxy for referral, not a documented referral. Pairs with fewer than 11 shared beneficiaries are suppressed.