Dr. Grantham Dewitt Warren, MD
- Medicare services, 2024
- 102
- Medicare patients, 2024
- 95
- Part D claims, 2024
- 419
- MIPS score, 2024
- 95
- Hospital affiliations
- 3
- Practice address
- 1700 Skylyn Dr, Spartanburg, SC 29307
- Practice phone
- Call (864) 573-3000
- Professional email
- Get professional email
- Personal email
- Get personal email
- Mobile number
- Get mobile number
Primary practice
Spartanburg Medical Center - Mary Black Campus
Spartanburg, South Carolina
Find Dr. Warren'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. Grantham Dewitt Warren is an OB-GYN in Spartanburg, South Carolina
Dr. Warren practices at Spartanburg Medical Center - Mary Black Campus in Spartanburg, South Carolina.
Dr. Warren's NPI, 1073583241, was assigned on January 23, 2006. Dr. Warren graduated from Brody School of Medicine at East Carolina University in 2000. Dr. Warren holds South Carolina license 26613.
- NPI
- 1073583241NPI Registry (opens in a new tab)
- Medicare PAC ID
- 1456243302
- NPI enumeration date
- January 23, 2006
- NPI status
- Active
- Accepts Medicare assignment
- Yes
- Practice phone
- (864) 573-3000
- Professional email
- Get email
- Personal email
- Get email
- Mobile number
- Get number
- Sex
- Male
- Estimated age
- 52
- Medical school graduation
- 2000
Sources: NPPES NPI Registry (CMS); Dmand AI Professional Profile Data; Dmand AI Practice Data; and Doctors and Clinicians National Downloadable File (CMS)
Dr. Grantham Dewitt Warren practices at Spartanburg Medical Center - Mary Black Campus in Spartanburg, South Carolina
Dr. Warren's primary practice is Spartanburg Medical Center - Mary Black Campus, at 1700 Skylyn Dr, Spartanburg, SC 29307 in Spartanburg County. The practice phone is (864) 573-3000.
- Spartanburg Medical Center - Mary Black Campus1700 Skylyn Dr, Spartanburg, SC 29307 · Spartanburg CountyPhone(864) 573-3000
Sources: NPPES NPI Registry (CMS); and Dmand AI Practice Data
Dr. Grantham Dewitt Warren is affiliated with 5 sites of care and 4 medical groups
Dr. Warren's primary practice is Spartanburg Medical Center - Mary Black Campus in Spartanburg, South Carolina. Dr. Warren is also affiliated with Spartanburg Medical Center. The medical group on file is Medical Group of the Carolinas - Family Medicine - Converse Heights. Dmand AI also links Dr. Warren to 2 more hospitals, 3 medical groups and 1 group practice or clinic, 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. Grantham Dewitt Warren's practice
Dmand AI tracks the electronic health record (EHR) system at each site where Dr. Warren practices, 4 sites in all. Vendor and product names are available with a free account.
| Site | EHR vendor and product |
|---|---|
| Spartanburg Medical Center - Mary Black Campus | Available with a free account |
| +4 more sites and 3 medical groups | Available with a free account |
Source: Dmand AI Technology Install Data
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Dr. Grantham Dewitt Warren is one of 648 OB-GYNs in South Carolina
Obstetrics and gynecology is Dr. Warren's primary specialty in the NPI Registry, under taxonomy code 207V00000X. Dr. Warren is licensed in South Carolina.
Specialties and state licenses
- Obstetrics and gynecology, South CarolinaPrimary
OB-GYNs near Dr. Warren
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. Grantham Dewitt Warren billed Medicare for 102 services in 2024
CMS data shows 102 Medicare services from Dr. Warren across 2 procedure codes in 2024, for 95 Medicare patients. Medicare paid $6,920 for them. Every service was in an office.
Dr. Warren's Medicare services by type, 2023 to 2024
- 2023
- 2024
- Office and hospital visits
- 2023: 762024: 805%
- Other services
- 2023: 252024: 2212%
Dr. Warren compared with the South Carolina median for OB-GYNs, 2024
- Dr. Warren
- South Carolina median
- Medicare services
- 102vs 6362% above
- Medicare patients
- 95vs 5283% above
- Part D claims
- 243vs 485.1 times
Medians across 589 OB-GYNs in South Carolina with Dmand AI profiles that report each measure.
Dr. Warren'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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Medicare shows one payer. Book a meeting to get commercial claims data for Dr. Warren and other OB-GYNs in South Carolina.
Sources: Medicare Physician & Other Practitioners - by Provider and Service (CMS), 2024 data; and Dmand AI Peer Benchmarks
Dr. Grantham Dewitt Warren treated 95 Medicare patients in 2024, average age 70
CMS counts 95 Medicare patients who saw Dr. Warren in 2024. The largest group is 65 to 74, with 60 patients. 69% of them have high cholesterol, and 63% have high blood pressure. Their average risk score is 0.76, where 1.00 is the Medicare average.
Across all payers, Dmand AI patient panel data puts Dr. Warren's median patient age at 45, with 99% women.
Dr. Warren's Medicare patients by age, 2024
CMS leaves out age groups with fewer than 11 patients.
Chronic conditions among Dr. Warren's Medicare patients, 2024
- High cholesterol69%
- High blood pressure63%
- Arthritis45%
- Anxiety25%
- Chronic kidney disease21%
- Diabetes21%
- Mood disorders19%
- Depression18%
Share of Medicare patients with each condition. A patient can have several.
Dr. Warren's patients across all payers
Dmand AI patient panel data covers Medicare, Medicaid and commercial patients.
Patient panel by age, all payers
Median age 45
Patient panel by sex, all payers
- Women99%
- Men0%
Sources: Dmand AI Patient Panel Data; and Medicare Physician & Other Practitioners - by Provider (CMS), 2024 data
Dr. Grantham Dewitt Warren wrote 419 Medicare Part D claims in 2024
In 2024, Dr. Warren wrote 419 Medicare Part D claims for 98 patients. 84% of them were for generic drugs. CMS names the drug for 243 of them, across 9 drugs with 11 or more claims each, at $29,150 in total drug cost. In 2023, CMS named 241 claims across 8 drugs.
Dr. Warren's Part D claims by kind of drug, 2024
- Generic351 claims84%
- Brand-name68 claims16%
Dr. Warren'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. Warren's Part D claims, 2024
- Antibiotics4%16 of 419 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: 2412024: 2431%
Drugs named by CMS: 9 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. Grantham Dewitt Warren scored 95 out of 100 in Medicare's MIPS program for 2024
CMS publishes a Merit-based Incentive Payment System (MIPS) score of 95 out of 100 for Dr. Warren for performance year 2024, reported through an alternative payment model (APM). Dr. Warren accepts Medicare assignment, so Medicare's approved amount is taken as full payment.
- Accepts Medicare assignment
- Yes
Dr. Warren's MIPS scores, performance year 2024
- 95of 100Final score
- 89.4of 100Quality
- 100of 100Promoting Interoperability
- 40of 100Improvement Activities
Each score is out of 100. The final score weighs the categories CMS scored for this clinician.
Removal of the uterus: 1 to 10 procedures (CMS shows small counts as a range)
Sources: Doctors and Clinicians National Downloadable File (CMS); Clinician Public Reporting: Overall MIPS Performance (CMS), 2024 data, released September 10, 2026; and Doctors and Clinicians Utilization Data (CMS)
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Dr. Grantham Dewitt Warren received $3,248 in industry payments from 2016 to 2025
CMS Open Payments shows 181 general payments to Dr. Warren from 39 drug and device companies from 2016 to 2025. Food and beverage make up the largest share, 91% of the total. Abbvie Inc. paid the most, $709.
General payments to Dr. Warren by program year, 2016 to 2025
General payments to Dr. Warren by kind, 2016 to 2025
- Food and beverage$2,94091%
- Education$3089%
Companies that paid Dr. Warren 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. Grantham Dewitt Warren graduated from Brody School of Medicine at East Carolina University
Dr. Warren graduated from Brody School of Medicine at East Carolina University in 2000.
- Medical school
Source: Dmand AI Professional Profile Data
Sources for Dr. Grantham Dewitt Warren'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 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)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 |
| 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. Grantham Dewitt Warren
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. Grantham Dewitt Warren's NPI number?
Dr. Grantham Dewitt Warren's NPI number is 1073583241. It was assigned on January 23, 2006, and it is active in the NPI Registry.
What kind of doctor is Dr. Grantham Dewitt Warren?
Dr. Grantham Dewitt Warren is an OB-GYN in Spartanburg, South Carolina. The primary specialty in the NPI Registry is Obstetrics & Gynecology Physician (taxonomy code 207V00000X).
Where does Dr. Grantham Dewitt Warren practice?
Dr. Warren practices at 1700 Skylyn Dr, Spartanburg, SC 29307. Dr. Warren's primary practice is Spartanburg Medical Center - Mary Black Campus in Spartanburg, South Carolina. Dmand AI also links Dr. Warren to 2 hospitals, 3 medical groups and 1 group practice or clinic.
What is Dr. Grantham Dewitt Warren's office phone number?
The practice phone on file for Dr. Warren is (864) 573-3000.
What is Dr. Grantham Dewitt Warren's medical license number?
Dr. Warren holds South Carolina license 26613.
Which hospitals is Dr. Grantham Dewitt Warren affiliated with?
Dr. Warren is affiliated with Spartanburg Medical Center. Dmand AI links Dr. Warren to 2 more hospitals.
What medical group is Dr. Grantham Dewitt Warren part of?
Dr. Warren is linked to Medical Group of the Carolinas - Family Medicine - Converse Heights. Dmand AI links Dr. Warren to 3 more medical groups.
Does Dr. Grantham Dewitt Warren accept Medicare?
Yes. CMS data shows Dr. Warren billed Medicare for 102 services in 2024, and Dr. Warren accepts Medicare assignment.
What is Dr. Grantham Dewitt Warren's MIPS score?
Dr. Warren's MIPS final score for performance year 2024 is 95 out of 100, reported through an alternative payment model (APM).
How many Medicare patients does Dr. Grantham Dewitt Warren see?
CMS counts 95 Medicare patients who saw Dr. Warren in 2024, with an average age of 70.
Show 5 more questionsShow fewer questions
What services does Dr. Grantham Dewitt Warren bill to Medicare?
In 2024, Dr. Warren's most billed Medicare services were office visit, established patient (99214) and medicare temporary code (Q0091).
Where did Dr. Grantham Dewitt Warren go to medical school?
Dr. Warren graduated from Brody School of Medicine at East Carolina University in 2000.
What drugs does Dr. Grantham Dewitt Warren prescribe most?
In 2024 Medicare Part D data, Dr. Warren's most prescribed drugs by claims were Estradiol, Premarin and Medroxyprogesterone Acetate.
Has Dr. Grantham Dewitt Warren received payments from drug or device companies?
CMS Open Payments shows $3,248 in general payments to Dr. Warren from 39 companies from 2016 to 2025. The largest total came from Abbvie Inc.
How long has Dr. Grantham Dewitt Warren been practicing?
Dr. Warren graduated from medical school in 2000, 26 years ago.
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