Dr. Mellissa Frances Sydney, DO
- Medicare services, 2024
- 912
- Medicare patients, 2024
- 578
- Part D claims, 2024
- 319
- MIPS score, 2024
- 97
- Hospital affiliations
- 3
- Practice address
- 1600 N Rose Ave, Oxnard, CA 93030
- Practice phone
- Call (805) 988-2500
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Find Dr. Sydney'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. Mellissa Frances Sydney is an emergency medicine physician in Oxnard, California
Dr. Sydney practices at Dignity Health - St. John's Regional Medical Center in Oxnard, California, part of CommonSpirit Health.
Dr. Sydney's NPI, 1114580941, was assigned on April 17, 2019. Dr. Sydney graduated from Pacific Northwest University of Health Sciences College of Osteopathic Medicine in 2019. Dr. Sydney holds California license 20A19950.
- NPI
- 1114580941NPI Registry (opens in a new tab)
- Medicare PAC ID
- 0648506766
- NPI enumeration date
- April 17, 2019
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (805) 988-2500
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 33
- Medical school graduation
- 2019
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Mellissa Frances Sydney practices at Dignity Health - St. John's Regional Medical Center in Oxnard, California
Dr. Sydney's primary practice is Dignity Health - St. John's Regional Medical Center, at 1600 N Rose Ave, Oxnard, CA 93030 in Ventura County. The practice phone is (805) 988-2500.
- Dignity Health - St. John's Regional Medical Center1600 N Rose Ave, Oxnard, CA 93030 · Ventura CountyPhone(805) 988-2500
Source: Dmand AI Affiliation Data
Dr. Mellissa Frances Sydney is affiliated with 3 sites of care and 1 medical group
Dr. Sydney's primary practice is Dignity Health - St. John's Regional Medical Center in Oxnard, California, part of CommonSpirit Health. Dr. Sydney is also affiliated with Dignity Health - Marian Regional Medical Center. The medical group on file is Vituity. Dmand AI also links Dr. Sydney to 1 more hospital, named with a free account.
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Mellissa Frances Sydney's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Sydney practices, 3 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Dignity Health - St. John's Regional Medical Center | Available with a free account |
| +2 more affiliated sites | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Mellissa Frances Sydney is one of 7,423 emergency medicine physicians in California
Emergency medicine is Dr. Sydney's primary specialty in the NPI Registry, under taxonomy code 207P00000X. Dmand AI has Dr. Sydney's licenses on file in 2 states: California and Michigan.
Specialties and state licenses
- Emergency medicine, CaliforniaPrimary
- Student in an organized health care education/training program, Michigan
Emergency medicine physicians near Dr. Sydney
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
Dr. Mellissa Frances Sydney billed Medicare for 912 services in 2024
CMS data shows 912 Medicare services from Dr. Sydney across 4 procedure codes in 2024, for 578 Medicare patients. Medicare paid $82,028 for them. Every service was in a facility, such as a hospital, rather than an office.
Dr. Sydney's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 7402024: 58421%
- Tests and treatments
- 2023: 3872024: 32815%
Dr. Sydney compared with the California median for emergency medicine physicians, 2024
- Dr. Sydney
- California median
- Medicare services
- 912vs 2653.4 times
- Medicare patients
- 578vs 2432.4 times
- Part D claims
- 174vs 622.8 times
Medians across 7,079 emergency medicine physicians in California with Dmand AI profiles that report each measure.
Dr. Sydney'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
Dr. Mellissa Frances Sydney treated 578 Medicare patients in 2024, average age 75
CMS counts 578 Medicare patients who saw Dr. Sydney in 2024. The largest group is 75 to 84, with 182 patients. 75% of them have high blood pressure, and 75% have high cholesterol. 38% are also on Medicaid. Their average risk score is 2.24, where 1.00 is the Medicare average, so they are sicker than most Medicare patients.
Across all payers, Dmand AI patient panel data puts Dr. Sydney's median patient age at 44, with 56% women.
Dr. Sydney's Medicare patients by age, 2024
Dr. Sydney's Medicare patients by sex, 2024
- Women34460%
- Men23440%
Chronic conditions among Dr. Sydney's Medicare patients, 2024
- High blood pressure75%
- High cholesterol75%
- Arthritis56%
- Diabetes44%
- Ischemic heart disease43%
- Anxiety40%
- Mood disorders39%
- Chronic kidney disease38%
Share of Medicare patients with each condition. A patient can have several.
Dr. Sydney's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 44
Patient panel by sex, all payers
- Women56%
- Men44%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Mellissa Frances Sydney wrote 319 Medicare Part D claims in 2024
In 2024, Dr. Sydney wrote 319 Medicare Part D claims for 217 patients. 96% of them were for generic drugs. CMS names the drug for 174 of them, across 7 drugs with 11 or more claims each, at $731 in total drug cost. In 2023, CMS named 172 claims across 9 drugs.
Dr. Sydney's Part D claims by kind of drug, 2024
- Generic306 claims96%
- Brand-name and other13 claims4%
Dr. Sydney'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. Sydney's Part D claims, 2024
- Opioids9%28 of 319 claims
- Antibiotics40%128 of 319 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: 1722024: 1741%
Drugs named by CMS: 7 in 2024, 9 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
Dr. Mellissa Frances Sydney scored 97 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 97 out of 100 for Dr. Sydney for performance year 2024, reported as part of a group. Dr. Sydney accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Sydney's MIPS scores, performance year 2024
- 97of 100Final score
- 90of 100Quality
- 40of 100Improvement Activities
- 78of 100Cost
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Sources: Doctors and Clinicians National Downloadable File (CMS); and Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026
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Dr. Mellissa Frances Sydney graduated from Pacific Northwest University of Health Sciences College of Osteopathic Medicine
Dr. Sydney graduated from Pacific Northwest University of Health Sciences College of Osteopathic Medicine in 2019.
- Medical school
Source: Dmand AI Professional Profile Data
Dr. Mellissa Frances Sydney accepts plans from 1 insurance carrier
Dr. Sydney is in network with 1 carrier, including CMS Medicare. Medicare plans come from the most carriers, 1. Check the plan with the practice before a visit.
- CMS Medicare
Source: Dmand AI Insurance Network Data
Sources for Dr. Mellissa Frances Sydney'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 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 | Doctors and Clinicians National Downloadable File (CMS) (opens in a new tab)Clinician Public Reporting: Overall MIPS Performance (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. Mellissa Frances Sydney
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. Mellissa Frances Sydney's NPI number?
Dr. Mellissa Frances Sydney's NPI number is 1114580941. It was assigned on April 17, 2019, and it is active in the NPI Registry.
What kind of doctor is Dr. Mellissa Frances Sydney?
Dr. Mellissa Frances Sydney is an emergency medicine physician in Oxnard, California. The primary specialty in the NPI Registry is Emergency Medicine Physician (taxonomy code 207P00000X).
Where does Dr. Mellissa Frances Sydney practice?
Dr. Sydney practices at 1600 N Rose Ave, Oxnard, CA 93030. Dr. Sydney's primary practice is Dignity Health - St. John's Regional Medical Center in Oxnard, California, part of CommonSpirit Health. Dmand AI also links Dr. Sydney to 1 hospital.
What is Dr. Mellissa Frances Sydney's office phone number?
The practice phone on file for Dr. Sydney is (805) 988-2500.
What is Dr. Mellissa Frances Sydney's medical license number?
Dr. Sydney holds California license 20A19950, one of the licenses on file in 2 states.
Which states has Dr. Mellissa Frances Sydney been licensed in?
Dmand AI has state licenses on file for Dr. Sydney in California (2022 to 2026) and Michigan (2019 to 2023).
Which hospitals is Dr. Mellissa Frances Sydney affiliated with?
Dr. Sydney practices at Dignity Health - St. John's Regional Medical Center in Oxnard, California. Dr. Sydney is also affiliated with Dignity Health - Marian Regional Medical Center. Dmand AI links Dr. Sydney to 1 more hospital.
What medical group is Dr. Mellissa Frances Sydney part of?
Dr. Sydney is linked to Vituity.
Does Dr. Mellissa Frances Sydney accept Medicare?
Yes. CMS data shows Dr. Sydney billed Medicare for 912 services in 2024, and Dr. Sydney accepts Medicare assignment.
What is Dr. Mellissa Frances Sydney's MIPS score?
Dr. Sydney's MIPS final score for performance year 2024 is 97 out of 100, reported as part of a group.
Show 6 more questionsShow fewer questions
How many Medicare patients does Dr. Mellissa Frances Sydney see?
CMS counts 578 Medicare patients who saw Dr. Sydney in 2024, with an average age of 75.
What services does Dr. Mellissa Frances Sydney bill to Medicare?
In 2024, Dr. Sydney's most billed Medicare services were emergency department visit (99285), heart test or procedure (93010) and emergency department visit (99284).
Where did Dr. Mellissa Frances Sydney go to medical school?
Dr. Sydney graduated from Pacific Northwest University of Health Sciences College of Osteopathic Medicine in 2019.
What drugs does Dr. Mellissa Frances Sydney prescribe most?
In 2024 Medicare Part D data, Dr. Sydney's most prescribed drugs by claims were Cephalexin, Ondansetron ODT and Hydrocodone-Acetaminophen.
How long has Dr. Mellissa Frances Sydney been practicing?
Dr. Sydney graduated from medical school in 2019, 7 years ago.
What insurance does Dr. Mellissa Frances Sydney accept?
Dr. Sydney is in network with 1 carrier, including CMS Medicare. Medicare plans come from the most carriers, 1. Check the plan with the practice before a visit.
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