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Dr. Rhonda Marcia Williams, MD
NPI1295991750PAC ID8527384791
- Medicare services, 2024
- 131
- Medicare patients, 2024
- 18
- Part D claims, 2024
- 302
- Publications
- 21
- Industry payments
- $108
- Practice address
- 16501 Ventura Blvd, Suite 103, Encino, CA 91436
- Practice phone
- Call (818) 501-1080
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Specialty Surgical Center of Encino
Surgery Center - Medicare-Certified · Encino, California
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Dr. Rhonda Marcia Williams is a psychiatrist in Encino, California
Dr. Williams practices at Specialty Surgical Center of Encino in Encino, California.
Dr. Williams' NPI, 1295991750, was assigned on August 4, 2008. Dr. Williams graduated from Keck School of Medicine of USC in 2005. Dr. Williams holds California license A100069.
NPI and contact details
- NPI
- 1295991750NPI Registry (opens in a new tab)
- Medicare PAC ID
- 8527384791
- NPI enumeration date
- August 4, 2008
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
- Practice phone
- (818) 501-1080
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Female
- Estimated age
- 47
- Medical school graduation
- 2005
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Affiliation Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Rhonda Marcia Williams practices at Specialty Surgical Center of Encino in Encino, California
Dr. Williams' primary practice is Specialty Surgical Center of Encino, at 16501 Ventura Blvd, Suite 103, Encino, CA 91436. The practice phone is (818) 501-1080.
- Specialty Surgical Center of Encino16501 Ventura Blvd, Suite 103, Encino, CA 91436Phone(818) 501-1080
Source: Dmand AI Affiliation Data
Dr. Rhonda Marcia Williams is affiliated with 2 sites of care and 2 medical groups
Dr. Williams' primary practice is Specialty Surgical Center of Encino in Encino, California. The medical group on file is Comprehensive Psychiatric Services. Dmand AI also links Dr. Williams to 1 more group practice or clinic and 1 medical group, each named with a free account.
Specialty Surgical Center of EncinoPrimary
Sources: Dmand AI Affiliation Data; and Dmand AI Org Hierarchy Data
Dmand AI tracks the EHR system at Dr. Rhonda Marcia Williams' practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Williams practices, 2 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Specialty Surgical Center of Encino | Available with a free account |
| +1 more site and 1 medical group | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Rhonda Marcia Williams is one of 6,803 psychiatrists in California
Psychiatry is Dr. Williams' primary specialty in the NPI Registry, under taxonomy code 2084P0800X. Dr. Williams is board certified in psychiatry by the American Board of Psychiatry and Neurology. Dr. Williams is licensed in California.
Specialties and state licenses
- Psychiatry, CaliforniaPrimary
Clinical focus
Dmand AI lists anxiety, bipolar disorder and depression among the conditions Dr. Williams treats.
Psychiatrists near Dr. Williams
Counts of psychiatrists with a Dmand AI profile, by place and practice. Each opens the list.
6,803psychiatrists in California
7psychiatrists in Encino
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Peer Benchmarks
Dr. Rhonda Marcia Williams billed Medicare for 131 services in 2024
CMS data shows 131 Medicare services from Dr. Williams across 2 procedure codes in 2024, for 18 Medicare patients. Medicare paid $9,778 for them. Every service was in an office.
Medicare services, 2024131
Medicare patients18
Paid by Medicare$9,778
Procedure codes2
Dr. Williams' Medicare services by type, 2023 to 2024
- 2023
- 2024
- Tests and treatments
- 2023: 462024: 6746%
- Office and hospital visits
- 2023: 392024: 6464%
Dr. Williams compared with the California median for psychiatrists, 2024
- Dr. Williams
- California median
- Medicare services
- 131vs 11910% above
- Medicare patients
- 18vs 4156% below
- Part D claims
- 224vs 14456% above
Medians across 6,809 psychiatrists in California with Dmand AI profiles that report each measure.
Dr. Williams' 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. Rhonda Marcia Williams treated 18 Medicare patients in 2024, average age 65
CMS counts 18 Medicare patients who saw Dr. Williams in 2024. 75% of them have anxiety, and 75% have depression. Their average risk score is 0.76, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Williams' median patient age at 43, with 77% women.
Medicare patients, 202418
Average age65
Average risk score0.76
Chronic conditions among Dr. Williams' Medicare patients, 2024
- Anxiety75%
- Depression75%
- Mood disorders75%
- High cholesterol61%
Share of Medicare patients with each condition. A patient can have several.
Dr. Williams' patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 43
Patient panel by sex, all payers
- Women77%
- Men21%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Rhonda Marcia Williams wrote 302 Medicare Part D claims in 2024
In 2024, Dr. Williams wrote 302 Medicare Part D claims for 29 patients. 100% of them were for generic drugs. CMS names the drug for 224 of them, across 10 drugs with 11 or more claims each, at $7,379 in total drug cost. In 2023, CMS named 137 claims across 8 drugs.
Part D claims, 2024302
Drugs named by CMS10
Total drug cost$7,379
Part D patients29
Dr. Williams' 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. Williams' Part D claims, 2024
- Antipsychotics, patients 65 and over8%25 of 302 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: 1372024: 22464%
Drugs named by CMS: 10 in 2024, 8 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. Rhonda Marcia Williams offers telehealth to Medicare patients
Dr. Williams accepts Medicare assignment, so Medicare's approved amount is taken as full payment. CMS lists Dr. Williams as offering telehealth.
- Accepts Medicare assignment
- Yes
- Offers telehealth
- Yes
Source: Doctors and Clinicians National Downloadable File (CMS)
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Dr. Rhonda Marcia Williams has 21 publications on record
Dmand AI links 21 papers to Dr. Williams, published from 2010 to 2015. The most frequent topics are Veterans, Amputation, Surgical and Multiple Sclerosis. Dr. Williams has published most often in Arch Phys Med Rehabil. Dr. Williams' most frequent co-authors are Michael Hatzakis, MD, Kathleen R. Bell and Dennis Neil Bourdette, MD.
Papers21
Years published2010 to 2015
Dr. Williams' papers by year, 2010 to 2015
Topics Dr. Williams writes about most
- Veterans
- Amputation, Surgical
- Multiple Sclerosis
- Social Support
- Stress Disorders, Post-Traumatic
- Artificial Limbs
- Brain Injuries
- Disability Evaluation
Dr. Williams' most frequent co-authors
- Michael Hatzakis, MD3 shared papers
- Kathleen R. Bell1 shared paper
- Dennis Neil Bourdette, MD1 shared paper
Recent publications by Dr. Williams
Arch Phys Med Rehabil
Age DistributionBrain InjuriesComorbidity
Amputation, SurgicalAnalysis of VarianceChi-Square Distribution
Disabil Rehabil
DepressionEmotionsEnvironment
Int J Geriatr Psychiatry
Attitude of Health PersonnelAttitude to ComputersCognition Disorders
See who Dr. Williams researches with
Physician Network Discovery turns co-authorship, shared hospitals and shared groups into a map of who Dr. Williams works with, so you can find a warm path to the right psychiatrists.
Sources: PubMed (National Library of Medicine); and Dmand AI Research Linkage
Dr. Rhonda Marcia Williams received $108 in industry payments from 2017 to 2019
CMS Open Payments shows 6 general payments to Dr. Williams from 3 drug and device companies from 2017 to 2019. Food and beverage make up the largest share, 100% of the total. Sunovion Pharmaceuticals Inc. paid the most, $67.
General payments to Dr. Williams by program year, 2017 to 2019
Companies that paid Dr. Williams the most, 2017 to 2019
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Rhonda Marcia Williams graduated from Keck School of Medicine of USC
Dr. Williams graduated from Keck School of Medicine of USC in 2005.
- Medical school
- Board certified in psychiatry
Source: Dmand AI Professional Profile Data
Dr. Rhonda Marcia Williams accepts plans from 9 insurance carriers
Dr. Williams is in network with 9 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Elevance. Medicare plans come from the most carriers, 8. Check the plan with the practice before a visit.
- Aetna
- Blue Cross Blue Shield of Michigan
- Elevance
- Blue Cross Blue Shield of Massachusetts
- HCSC
- Molina
- Regence Health Plans
- CMS Medicare
- +1 more carriersWith a free account
Plan types Dr. Williams accepts, by number of carriers
- Medicare8
- PPO6
- HMO4
- EPO2
- POS2
Source: Dmand AI Insurance Network Data
Sources for Dr. Rhonda Marcia Williams'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) |
| Publications, topics and co-authors | PubMed (National Library of Medicine) (opens in a new tab)Dmand AI Research Linkage |
| 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. Rhonda Marcia Williams
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. Rhonda Marcia Williams' NPI number?
Dr. Rhonda Marcia Williams' NPI number is 1295991750. It was assigned on August 4, 2008, and it is active in the NPI Registry.
What kind of doctor is Dr. Rhonda Marcia Williams?
Dr. Rhonda Marcia Williams is a psychiatrist in Encino, California. The primary specialty in the NPI Registry is Psychiatry Physician (taxonomy code 2084P0800X).
Where does Dr. Rhonda Marcia Williams practice?
Dr. Williams practices at 16501 Ventura Blvd, Suite 103, Encino, CA 91436. Dr. Williams' primary practice is Specialty Surgical Center of Encino in Encino, California. Dmand AI also links Dr. Williams to 1 group practice or clinic and 1 medical group.
What is Dr. Rhonda Marcia Williams' office phone number?
The practice phone on file for Dr. Williams is (818) 501-1080.
What is Dr. Rhonda Marcia Williams' medical license number?
Dr. Williams holds California license A100069.
What medical group is Dr. Rhonda Marcia Williams part of?
Dr. Williams is linked to Comprehensive Psychiatric Services. Dmand AI links Dr. Williams to 1 more medical group.
Does Dr. Rhonda Marcia Williams accept Medicare?
Yes. CMS data shows Dr. Williams billed Medicare for 131 services in 2024, and Dr. Williams accepts Medicare assignment.
Does Dr. Rhonda Marcia Williams offer telehealth?
Yes. The CMS Doctors and Clinicians file lists Dr. Williams as offering telehealth services.
How many Medicare patients does Dr. Rhonda Marcia Williams see?
CMS counts 18 Medicare patients who saw Dr. Williams in 2024, with an average age of 65.
Is Dr. Rhonda Marcia Williams board certified?
Yes. Dr. Williams is board certified in psychiatry by the American Board of Psychiatry and Neurology.
Show 8 more questionsShow fewer questions
What services does Dr. Rhonda Marcia Williams bill to Medicare?
In 2024, Dr. Williams' most billed Medicare services were psychiatric service (90833) and office visit, established patient (99214).
Where did Dr. Rhonda Marcia Williams go to medical school?
Dr. Williams graduated from Keck School of Medicine of USC in 2005.
What drugs does Dr. Rhonda Marcia Williams prescribe most?
In 2024 Medicare Part D data, Dr. Williams' most prescribed drugs by claims were Bupropion XL, Escitalopram Oxalate and Lamotrigine.
Has Dr. Rhonda Marcia Williams received payments from drug or device companies?
CMS Open Payments shows $108 in general payments to Dr. Williams from 3 companies from 2017 to 2019. The largest total came from Sunovion Pharmaceuticals Inc.
How long has Dr. Rhonda Marcia Williams been practicing?
Dr. Williams graduated from medical school in 2005, 21 years ago.
Does Dr. Rhonda Marcia Williams do research?
Dmand AI links 21 publications to Dr. Williams, published from 2010 to 2015.
Who does Dr. Rhonda Marcia Williams publish with?
Dr. Williams' most frequent co-authors are Michael Hatzakis, MD (3 shared papers), Kathleen R. Bell (1 shared paper) and Dennis Neil Bourdette, MD (1 shared paper).
What insurance does Dr. Rhonda Marcia Williams accept?
Dr. Williams is in network with 9 carriers, including Aetna, Blue Cross Blue Shield of Michigan and Elevance. Medicare plans come from the most carriers, 8. Check the plan with the practice before a visit.
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