Dr. Robert Charles Southmayd, DO
- Part D claims, 2024
- 681
- Industry payments
- $29
- Affiliated sites
- 1
- Medical groups
- 2
- Insurance carriers
- 6
- Practice address
- 103 Modesto Ave, Modesto, CA 95354
- Practice phone
- Call (209) 527-4597
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Aegis Treatment Centers
Modesto, California
Find Dr. Southmayd'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. Robert Charles Southmayd is an OB-GYN in Modesto, California
Dr. Southmayd practices at Aegis Treatment Centers in Modesto, California.
Dr. Southmayd's NPI, 1982700969, was assigned on September 16, 2006. Dr. Southmayd graduated from WesternU College of Osteopathic Medicine of the Pacific in 1985. Dr. Southmayd holds California license 20A5298.
- NPI
- 1982700969NPI Registry (opens in a new tab)
- NPI enumeration date
- September 16, 2006
- NPI status
- Active
- Practice phone
- (209) 527-4597
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Medical school graduation
- 1985
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; and Dmand AI Practice Data
Dr. Robert Charles Southmayd practices at Aegis Treatment Centers in Modesto, California
Dr. Southmayd's primary practice is Aegis Treatment Centers, at 103 Modesto Ave, Modesto, CA 95354 in Stanislaus County. The practice phone is (209) 527-4597.
- Aegis Treatment Centers103 Modesto Ave, Modesto, CA 95354 · Stanislaus CountyPhone(209) 527-4597
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Robert Charles Southmayd is affiliated with 2 sites of care and 2 medical groups
Dr. Southmayd's primary practice is Aegis Treatment Centers in Modesto, California. The medical group on file is San Joaquin County Behavioral Health Services. Dmand AI also links Dr. Southmayd to 1 more group practice or clinic and 1 medical group, each named with a free account.
Sources: NPPES NPI Registry (CMS); Dmand AI Practice Data; and Dmand AI Affiliation Data
Dmand AI tracks the EHR system at Dr. Robert Charles Southmayd's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Southmayd practices. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Aegis Treatment Centers | 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. Robert Charles Southmayd is one of 4,642 OB-GYNs in California
Obstetrics and gynecology is Dr. Southmayd's primary specialty in the NPI Registry, under taxonomy code 207V00000X. Dr. Southmayd is board certified in obstetrics & gynecology by the American Board of Obstetrics and Gynecology. Dr. Southmayd is licensed in California.
Specialties and state licenses
- Obstetrics and gynecology, CaliforniaPrimary
OB-GYNs near Dr. Southmayd
Counts of OB-GYNs 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. Robert Charles Southmayd's patients have a median age of 37
Across all payers, Dmand AI patient panel data puts Dr. Southmayd's median patient age at 37, with 58% women.
Dr. Southmayd's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 37
Patient panel by sex, all payers
- Women58%
- Men41%
Source: Dmand AI Patient Panel Data
Dr. Robert Charles Southmayd wrote 681 Medicare Part D claims in 2024
In 2024, Dr. Southmayd wrote 681 Medicare Part D claims for 370 patients. 90% of them were for generic drugs. CMS names the drug for 461 of them, across 19 drugs with 11 or more claims each, at $7,558 in total drug cost.
Dr. Southmayd's Part D claims by kind of drug, 2024
- Generic615 claims90%
- Brand-name and other66 claims10%
Dr. Southmayd'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. Southmayd's Part D claims, 2024
- Opioids2%12 of 681 claims
- Antibiotics36%248 of 681 claims
Share of all Part D claims for each drug class CMS reports on. Classes with no claims are left out.
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
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Dr. Robert Charles Southmayd received $29 in industry payments in 2025
CMS Open Payments shows 1 general payment to Dr. Southmayd from 1 drug or device company in 2025. Food and beverage make up the largest share, 100% of the total. Alkermes, Inc. paid the most, $29.
Companies that paid Dr. Southmayd the most, 2025 to 2025
Share is of all general payments to this clinician.
Source: Open Payments (CMS), 2025 data, released July 7, 2026
Dr. Robert Charles Southmayd graduated from WesternU College of Osteopathic Medicine of the Pacific
Dr. Southmayd graduated from WesternU College of Osteopathic Medicine of the Pacific in 1985.
- Medical school
- Board certified in obstetrics & gynecology
- Board certified in addiction medicine (caq)
- Board certified in 1986 - 2027
Source: Dmand AI Professional Profile Data
Dr. Robert Charles Southmayd accepts plans from 6 insurance carriers
Dr. Southmayd is in network with 6 carriers, including Elevance, Aetna and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 6. Check the plan with the practice before a visit.
- Elevance
- Aetna
- Blue Cross Blue Shield of Massachusetts
- Blue Cross Blue Shield of Michigan
- HCSC
- Regence Health Plans
Plan types Dr. Southmayd accepts, by number of carriers
- Medicare6
- PPO6
- EPO1
- HMO1
- POS1
Source: Dmand AI Insurance Network Data
Sources for Dr. Robert Charles Southmayd'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 Practice Data |
| Primary practice, affiliations and health system | NPPES NPI Registry (CMS) (opens in a new tab)Dmand AI Practice DataDmand AI Affiliation Data |
| Medicare patients and the all-payer patient panel | Dmand AI Patient Panel Data |
| 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) |
| 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. Robert Charles Southmayd
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. Robert Charles Southmayd's NPI number?
Dr. Robert Charles Southmayd's NPI number is 1982700969. It was assigned on September 16, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Robert Charles Southmayd?
Dr. Robert Charles Southmayd is an OB-GYN in Modesto, California. The primary specialty in the NPI Registry is Obstetrics & Gynecology Physician (taxonomy code 207V00000X).
Where does Dr. Robert Charles Southmayd practice?
Dr. Southmayd practices at 103 Modesto Ave, Modesto, CA 95354. Dr. Southmayd's primary practice is Aegis Treatment Centers in Modesto, California. Dmand AI also links Dr. Southmayd to 1 group practice or clinic and 1 medical group.
What is Dr. Robert Charles Southmayd's office phone number?
The practice phone on file for Dr. Southmayd is (209) 527-4597.
What is Dr. Robert Charles Southmayd's medical license number?
Dr. Southmayd holds California license 20A5298.
What medical group is Dr. Robert Charles Southmayd part of?
Dr. Southmayd is linked to San Joaquin County Behavioral Health Services. Dmand AI links Dr. Southmayd to 1 more medical group.
Is Dr. Robert Charles Southmayd board certified?
Yes. Dr. Southmayd is board certified in obstetrics & gynecology by the American Board of Obstetrics and Gynecology.
Where did Dr. Robert Charles Southmayd go to medical school?
Dr. Southmayd graduated from WesternU College of Osteopathic Medicine of the Pacific in 1985.
What drugs does Dr. Robert Charles Southmayd prescribe most?
In 2024 Medicare Part D data, Dr. Southmayd's most prescribed drugs by claims were Azithromycin, Sulfamethoxazole-Trimethoprim and Ibuprofen.
Has Dr. Robert Charles Southmayd received payments from drug or device companies?
CMS Open Payments shows $29 in general payments to Dr. Southmayd from 1 company from 2025 to 2025. The largest total came from Alkermes, Inc.
How long has Dr. Robert Charles Southmayd been practicing?
Dr. Southmayd graduated from medical school in 1985, 41 years ago.
What insurance does Dr. Robert Charles Southmayd accept?
Dr. Southmayd is in network with 6 carriers, including Elevance, Aetna and Blue Cross Blue Shield of Massachusetts. Medicare plans come from the most carriers, 6. Check the plan with the practice before a visit.
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