Mallory Katherine Willenborg, PA-C
- Medicare services, 2024
- 116
- Medicare patients, 2024
- 125
- Part D claims, 2024
- 114
- MIPS score, 2024
- 100
- Hospital affiliations
- 2
- Practice address
- One Hoag Drive, Newport Beach, CA 92663
- Practice phone
- Call (949) 764-4624
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Find Mallory Willenborg's professional email, personal email and mobile number
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Mallory Katherine Willenborg is an emergency medicine physician in Newport Beach, California
Mallory Willenborg practices at Hoag Hospital Newport Beach in Newport Beach, California, part of Hoag Memorial Hospital Presbyterian.
Mallory Willenborg's NPI, 1598213886, was assigned on September 14, 2016. Mallory Willenborg holds California license 53867.
- NPI
- 1598213886NPI Registry (opens in a new tab)
- NPI enumeration date
- September 14, 2016
- NPI status
- Active
- Practice phone
- (949) 764-4624
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 36
- Medical school graduation
- 2016
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Affiliation Data
Mallory Katherine Willenborg practices at 2 locations in Newport Beach, California
Mallory Willenborg's primary practice is Hoag Hospital Newport Beach, at One Hoag Drive, Newport Beach, CA 92663 in Orange County. The practice phone is (949) 764-4624. Mallory Willenborg also practices at Hoag Hospital Newport Beach, 1 Hoag Dr, Newport Beach, CA 92663.
- Hoag Hospital Newport BeachPrimaryOne Hoag Drive, Newport Beach, CA 92663 · Orange CountyPhone(949) 764-4624
- Hoag Hospital Newport Beach1 Hoag Dr, Newport Beach, CA 92663 · Orange CountyPhone(949) 764-4624
Sources: NPPES NPI Registry (CMS); Dmand AI Affiliation Data; and Dmand AI Practice Data
Mallory Katherine Willenborg is affiliated with 2 sites of care and 3 medical groups
Mallory Willenborg's primary practice is Hoag Hospital Newport Beach in Newport Beach, California, part of Hoag Memorial Hospital Presbyterian. Mallory Willenborg is also affiliated with Arrowhead Regional Medical Center. The medical group on file is Vituity. Dmand AI also links Mallory Willenborg to 2 more medical groups, each named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Mallory Katherine Willenborg's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Mallory Willenborg practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Hoag Hospital Newport Beach | Available with a free account |
| +1 more site and 2 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
For health IT teams
Dmand AI maps EHR vendors, IT decision makers and buying committees across Hoag Memorial Hospital Presbyterian and 6.2K+ hospitals, with verified contacts in the same login.
Mallory Katherine Willenborg is one of 7,423 emergency medicine physicians in California
Emergency medicine is Mallory Willenborg's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dmand AI has Mallory Willenborg's licenses on file in 2 states: California and Florida.
Specialties and state licenses
- Emergency medicine, CaliforniaPrimary
- Physician assistant, Florida
Emergency medicine physicians near Mallory Willenborg
Counts of emergency medicine physicians 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
Mallory Katherine Willenborg billed Medicare for 116 services in 2024
CMS data shows 116 Medicare services from Mallory Willenborg across 2 procedure codes in 2024, for 125 Medicare patients. Medicare paid $12,766 for them. Every service was in a facility, such as a hospital, rather than an office.
Mallory Willenborg's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 742024: 11657%
Mallory Willenborg compared with the California median for emergency medicine physicians, 2024
- Mallory Willenborg
- California median
- Medicare services
- 116vs 26556% below
- Medicare patients
- 125vs 24349% below
- Part D claims
- 34vs 6245% below
Medians across 7,079 emergency medicine physicians in California with Dmand AI profiles that report each measure.
Mallory Willenborg's most billed Medicare procedure codes, 2024
CMS publishes codes billed for 11 or more Medicare patients. Each label is the code family; CPT descriptions are licensed by the AMA.
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Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Mallory Katherine Willenborg treated 125 Medicare patients in 2024, average age 74
CMS counts 125 Medicare patients who saw Mallory Willenborg in 2024. The largest group is 65 to 74, with 55 patients. 75% of them have high cholesterol, and 70% have high blood pressure. 12% are also on Medicaid. Their average risk score is 1.24, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Mallory Willenborg's median patient age at 35, with 54% women.
Mallory Willenborg's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Mallory Willenborg's Medicare patients by sex, 2024
- Women7560%
- Men5040%
Chronic conditions among Mallory Willenborg's Medicare patients, 2024
- High cholesterol75%
- High blood pressure70%
- Arthritis58%
- Anxiety25%
- Ischemic heart disease23%
- Mood disorders23%
- Atrial fibrillation22%
- Diabetes22%
Share of Medicare patients with each condition. A patient can have several.
Mallory Willenborg's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 35
Patient panel by sex, all payers
- Women54%
- Men45%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Mallory Katherine Willenborg wrote 114 Medicare Part D claims in 2024
In 2024, Mallory Willenborg wrote 114 Medicare Part D claims for 77 patients. 96% of them were for generic drugs. CMS names the drug for 34 of them, across 2 drugs with 11 or more claims each, at $152 in total drug cost. In 2023, CMS named 12 claims across 1 drug.
Mallory Willenborg's Part D claims by kind of drug, 2024
- Generic109 claims96%
- Brand-name and other5 claims4%
Mallory Willenborg'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 Mallory Willenborg's Part D claims, 2024
- Opioids19%22 of 114 claims
- Antibiotics38%43 of 114 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: 122024: 34183%
Drugs named by CMS: 2 in 2024, 1 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
Mallory Katherine Willenborg scored 100 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 100 out of 100 for Mallory Willenborg for performance year 2024, reported as part of a group.
Mallory Willenborg's MIPS scores, performance year 2024
- 100of 100Final score
- 96.4of 100Quality
- 40of 100Improvement Activities
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Source: Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Sources for Mallory Katherine Willenborg'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 | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Affiliation DataDmand AI Practice Data |
| Primary practice, affiliations and health system | Dmand AI Affiliation DataDmand AI Org Hierarchy 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 | Clinician Public Reporting: Overall MIPS Performance (CMS) (opens in a new tab) |
| 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 Mallory Katherine Willenborg
Spotted something out of date? Email hello@dmand.ai and we will check the record. Contact details live in the free trial.
What is Mallory Katherine Willenborg's NPI number?
Mallory Katherine Willenborg's NPI number is 1598213886. It was assigned on September 14, 2016, and it is active in the NPI Registry.
What does Mallory Katherine Willenborg specialize in?
Mallory Katherine Willenborg is an emergency medicine physician in Newport Beach, California. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Mallory Katherine Willenborg practice?
Mallory Willenborg practices at One Hoag Drive, Newport Beach, CA 92663. Mallory Willenborg also practices at 1 Hoag Dr, Newport Beach, CA 92663. Mallory Willenborg's primary practice is Hoag Hospital Newport Beach in Newport Beach, California, part of Hoag Memorial Hospital Presbyterian. Dmand AI also links Mallory Willenborg to 2 medical groups.
What is Mallory Katherine Willenborg's office phone number?
The practice phone on file for Mallory Willenborg is (949) 764-4624.
What is Mallory Katherine Willenborg's medical license number?
Mallory Willenborg holds California license 53867, one of the licenses on file in 2 states.
Which states has Mallory Katherine Willenborg been licensed in?
Dmand AI has state licenses on file for Mallory Willenborg in California and Florida.
Which hospitals is Mallory Katherine Willenborg affiliated with?
Mallory Willenborg practices at Hoag Hospital Newport Beach in Newport Beach, California. Mallory Willenborg is also affiliated with Arrowhead Regional Medical Center.
What medical group is Mallory Katherine Willenborg part of?
Mallory Willenborg is linked to Vituity. Dmand AI links Mallory Willenborg to 2 more medical groups.
Does Mallory Katherine Willenborg accept Medicare?
Yes. CMS data shows Mallory Willenborg billed Medicare for 116 services in 2024.
What is Mallory Katherine Willenborg's MIPS score?
Mallory Willenborg's MIPS final score for performance year 2024 is 100 out of 100, reported as part of a group.
Show 4 more questionsShow fewer questions
How many Medicare patients does Mallory Katherine Willenborg see?
CMS counts 125 Medicare patients who saw Mallory Willenborg in 2024, with an average age of 74.
What services does Mallory Katherine Willenborg bill to Medicare?
In 2024, Mallory Willenborg's most billed Medicare services were emergency department visit (99285) and emergency department visit (99284).
What drugs does Mallory Katherine Willenborg prescribe most?
In 2024 Medicare Part D data, Mallory Willenborg's most prescribed drugs by claims were Cephalexin and Hydrocodone-Acetaminophen.
How long has Mallory Katherine Willenborg been practicing?
Mallory Willenborg graduated from medical school in 2016, 10 years ago.
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