Dr. Darryl Alan Willoughby, MD
- Medicare services, 2023
- 34
- Medicare patients, 2024
- 18
- Part D claims, 2024
- 125
- Hospital affiliations
- 2
- Industry payments
- $1,203
- Practice address
- 1513 S Grand Ave Suite 208 Suite 208, Los Angeles, CA 90015-3075
- Practice phone
- Call (213) 705-8088
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
California Orthopedic & Microsurgery Institute
Surgical practice · Los Angeles, California
Find Dr. Willoughby's professional email, personal email and mobile number
Dmand AI checks each channel through healthcare-specific waterfall enrichment. See what is on file with a free account, with practice phones, licenses and affiliations.
Dr. Darryl Alan Willoughby is a general surgeon in Los Angeles, California
Dr. Willoughby practices at California Orthopedic & Microsurgery Institute in Los Angeles, California.
Dr. Willoughby's NPI, 1962585570, was assigned on October 24, 2006. Dr. Willoughby graduated from David Geffen School of Medicine at UCLA in 1993. Dr. Willoughby holds California license A54030.
- NPI
- 1962585570NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0244227494
- NPI enumeration date
- October 24, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (213) 705-8088
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 59
- Medical school graduation
- 1993
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Darryl Alan Willoughby practices at California Orthopedic & Microsurgery Institute in Los Angeles, California
Dr. Willoughby's primary practice is California Orthopedic & Microsurgery Institute, at 1513 S Grand Ave Suite 208 Suite 208, Los Angeles, CA 90015-3075. The practice phone is (213) 705-8088.
- California Orthopedic & Microsurgery Institute1513 S Grand Ave Suite 208 Suite 208, Los Angeles, CA 90015-3075Phone(213) 705-8088
Source: Dmand AI Affiliation Data
Dr. Darryl Alan Willoughby is affiliated with 3 sites of care and 2 medical groups
Dr. Willoughby's primary practice is California Orthopedic & Microsurgery Institute in Los Angeles, California. Dr. Willoughby is also affiliated with Martin Luther King, Jr. Community Hospital. The medical group on file is Harbor-UCLA Medical Center. Dmand AI also links Dr. Willoughby to 1 more hospital and 1 medical group, each named with a free account.
Source: Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Darryl Alan Willoughby's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Willoughby practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| California Orthopedic & Microsurgery Institute | Available with a free account |
| +2 more sites and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Darryl Alan Willoughby is one of 2,926 general surgeons in California
Surgery is Dr. Willoughby's primary specialty in the NPI Registry, under taxonomy code 208600000X. Dr. Willoughby is board certified in orthopaedic surgery by the American Board of Orthopaedic Surgery. Dr. Willoughby is licensed in California.
Specialties and state licenses
- Surgery, CaliforniaPrimary
Clinical focus
Dmand AI lists arthritis, broken or dislocated ankle/ or foot, joint pain, knee arthroscopy, knee injury and pelvic and hip fracture among the conditions Dr. Willoughby treats.
General surgeons near Dr. Willoughby
Counts of general surgeons with a Dmand AI profile, by place and practice. Each opens the list.
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Darryl Alan Willoughby billed Medicare for 34 services in 2023
CMS data shows 34 Medicare services from Dr. Willoughby across 1 procedure code in 2023, all of them office visits, for 18 Medicare patients. Medicare paid $2,889 for them. Every service was in an office.
Dr. Willoughby's Medicare services by type, 2021 to 2023
- 2021
- 2023
- Office and hospital visits
- 2021: 142023: 34143%
Dr. Willoughby compared with the California median for general surgeons, 2023
- Dr. Willoughby
- California median
- Medicare services
- 34vs 16680% below
- Medicare patients
- 18vs 12185% below
- Part D claims
- 88vs 342.6 times
Medians across 2,606 general surgeons in California with Dmand AI profiles that report each measure.
Dr. Willoughby's most billed Medicare procedure codes, 2023
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
Need commercial claims for Dr. Willoughby?
Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Willoughby and other general surgeons in California.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Darryl Alan Willoughby treated 18 Medicare patients in 2024, average age 70
CMS counts 18 Medicare patients who saw Dr. Willoughby in 2024. 75% of them have high blood pressure, and 75% have high cholesterol. Their average risk score is 1.27, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Willoughby's median patient age at 54, with 46% women.
Chronic conditions among Dr. Willoughby's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
Share of Medicare patients with each condition. A patient can have several.
Dr. Willoughby's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 54
Patient panel by sex, all payers
- Women46%
- Men54%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Darryl Alan Willoughby wrote 125 Medicare Part D claims in 2024
In 2024, Dr. Willoughby wrote 125 Medicare Part D claims for 39 patients. 100% of them were for generic drugs. CMS names the drug for 88 of them, across 2 drugs with 11 or more claims each, at $876 in total drug cost. In 2023, CMS named 164 claims across 5 drugs.
Dr. Willoughby's most prescribed drugs by claims, 2024
CMS names a drug when it has 11 or more claims. Share is of the claims for drugs CMS names.
Drug classes CMS tracks in Dr. Willoughby's Part D claims, 2024
- Opioids46%58 of 125 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
Part D claims for drugs CMS names, 2023 to 2024
- 2023
- 2024
- Claims for drugs CMS names
- 2023: 1642024: 8846%
Drugs named by CMS: 2 in 2024, 5 in 2023.
Sources: Medicare Part D Prescribers - by Provider and Drug (CMS), 2024 data, released May 6, 2026; and Medicare Part D Prescribers - by Provider (CMS), 2024 data
How Dr. Darryl Alan Willoughby takes part in Medicare
Dr. Willoughby accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Removal of tissue: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); and Doctors and Clinicians Utilization Data (CMS)
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Dr. Darryl Alan Willoughby received $1,203 in industry payments from 2016 to 2025
CMS Open Payments shows 38 general payments to Dr. Willoughby from 8 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 100% of the total. Stryker Corporation paid the most, $733.
General payments to Dr. Willoughby by program year, 2016 to 2025
Companies that paid Dr. Willoughby the most, 2016 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Darryl Alan Willoughby graduated from David Geffen School of Medicine at UCLA
Dr. Willoughby graduated from David Geffen School of Medicine at UCLA in 1993.
- Medical school
- Board certified in orthopaedic surgery
Source: Dmand AI Professional Profile Data
Dr. Darryl Alan Willoughby accepts plans from 8 insurance carriers
Dr. Willoughby is in network with 8 carriers, including Aetna, Blue Cross Blue Shield of Michigan and LA Care. Medicare plans come from the most carriers, 8. Check the plan with the practice before a visit.
- Aetna
- Blue Cross Blue Shield of Michigan
- LA Care
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Molina
- Regence Health Plans
- CMS Medicare
Plan types Dr. Willoughby accepts, by number of carriers
- Medicare8
- PPO5
- HMO4
- POS2
- EPO1
- Medicaid1
Source: Dmand AI Insurance Network Data
Sources for Dr. Darryl Alan Willoughby's profile data
| Data on this page | Source |
|---|---|
| NPI, name, sex, specialty and licenses | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Professional Profile Data |
| Practice locations and phone | Dmand AI Affiliation Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation Data |
| Medicare services and procedure codes | Medicare Physician & Other Practitioners - by Provider and Service (CMS) (opens in a new tab) |
| State medians for the same specialty | Dmand AI Peer Benchmarks |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel DataMedicare Physician & Other Practitioners - by Provider (CMS) (opens in a new tab) |
| Part D prescribing | Medicare Part D Prescribers - by Provider and Drug (CMS) (opens in a new tab)Medicare Part D Prescribers - by Provider (CMS) (opens in a new tab) |
| MIPS scores, telehealth, assignment and procedure percentiles | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Doctors and Clinicians Utilization Data (CMS) (opens in a new tab) |
| Industry payments | Open Payments (CMS) (opens in a new tab) |
| Training, board certification and memberships | Dmand AI Professional Profile Data |
| Insurance carriers and plan types | Dmand AI Insurance Network Data |
| EHR at each practice site | Dmand AI Technology Install Data |
| Similar physicians | Dmand AI Affiliation Data |
Data last refreshed October 2026Report an inaccuracyRemove my information
FAQ
Frequently asked questions about Dr. Darryl Alan Willoughby
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Dr. Darryl Alan Willoughby's NPI number?
Dr. Darryl Alan Willoughby's NPI number is 1962585570. It was assigned on October 24, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Darryl Alan Willoughby?
Dr. Darryl Alan Willoughby is a general surgeon in Los Angeles, California. The primary specialty in the NPI Registry is Surgery Physician (taxonomy code 208600000X).
Where does Dr. Darryl Alan Willoughby practice?
Dr. Willoughby practices at 1513 S Grand Ave Suite 208 Suite 208, Los Angeles, CA 90015-3075. Dr. Willoughby's primary practice is California Orthopedic & Microsurgery Institute in Los Angeles, California. Dmand AI also links Dr. Willoughby to 1 hospital and 1 medical group.
What is Dr. Darryl Alan Willoughby's office phone number?
The practice phone on file for Dr. Willoughby is (213) 705-8088.
What is Dr. Darryl Alan Willoughby's medical license number?
Dr. Willoughby holds California license A54030.
Which hospitals is Dr. Darryl Alan Willoughby affiliated with?
Dr. Willoughby is affiliated with Martin Luther King, Jr. Community Hospital. Dmand AI links Dr. Willoughby to 1 more hospital.
What medical group is Dr. Darryl Alan Willoughby part of?
Dr. Willoughby is linked to Harbor-UCLA Medical Center. Dmand AI links Dr. Willoughby to 1 more medical group.
Does Dr. Darryl Alan Willoughby accept Medicare?
Yes. CMS data shows Dr. Willoughby billed Medicare for 34 services in 2023, and Dr. Willoughby accepts Medicare assignment.
How many Medicare patients does Dr. Darryl Alan Willoughby see?
CMS counts 18 Medicare patients who saw Dr. Willoughby in 2024, with an average age of 70.
Is Dr. Darryl Alan Willoughby board certified?
Yes. Dr. Willoughby is board certified in orthopaedic surgery by the American Board of Orthopaedic Surgery.
Show 6 more questionsShow fewer questions
What services does Dr. Darryl Alan Willoughby bill to Medicare?
In 2023, Dr. Willoughby's most billed Medicare services were office visit, established patient (99214).
Where did Dr. Darryl Alan Willoughby go to medical school?
Dr. Willoughby graduated from David Geffen School of Medicine at UCLA in 1993.
What drugs does Dr. Darryl Alan Willoughby prescribe most?
In 2024 Medicare Part D data, Dr. Willoughby's most prescribed drugs by claims were Tramadol HCl and Diclofenac Sodium.
Has Dr. Darryl Alan Willoughby received payments from drug or device companies?
CMS Open Payments shows $1,203 in general payments to Dr. Willoughby from 8 companies from 2016 to 2025. The largest total came from Stryker Corporation.
How long has Dr. Darryl Alan Willoughby been practicing?
Dr. Willoughby graduated from medical school in 1993, 33 years ago.
What insurance does Dr. Darryl Alan Willoughby accept?
Dr. Willoughby is in network with 8 carriers, including Aetna, Blue Cross Blue Shield of Michigan and LA Care. Medicare plans come from the most carriers, 8. Check the plan with the practice before a visit.
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