Robert C. Grayson, MD
Obstetrics & Gynecology Physician · Phoenix, AZ
Robert C. Grayson, MD is an obstetrics & gynecology physician with a practice address in Phoenix, Arizona, and NPI 1649234279, issued on Apr 12, 2006. Check the license (Arizona 21634, as entered in NPPES) on the Arizona Medical Board; the Medicare figures below come from public CMS files.
- Name
- Robert C. Grayson
- Credential
- MD
- Primary taxonomy
- Obstetrics & Gynecology Physician 207V00000X
- License number
- 21634 AZ
Self-reported in NPPES; status is on the state search - Practice location
- 16611 S 40TH St, Phoenix, AZ 85048
- Phone
- (480) 785-2100
- Enumerated
- Apr 12, 2006
- Record last updated
- Sep 5, 2018 (not updated in 8 years: call before relying on the address or phone)
- Fax
- (480) 785-2100
- Medicaid ID
- 174996 AZ
- Medicare enrollment
- Enrolled (PECOS I20040817000352); accepts Medicare assignment
- Medical or professional school
- University Of Southern California Keck School Of Medicine, 1990
- Entity
- Type 1 · individual
8 nearest obstetrics & gynecology physician records → All 803 in Arizona → Look up another NPI →
Also registered at 16611 S 40TH St
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Michelle Babcock, PT MSPTPhysical Therapist1689627630
- Kimberly Balk, MDObstetrics & Gynecology Physician1902869027
- Brian Bartow, PT,DPTPhysical Therapist1295134914
- Tara Becher, PA-CPhysician Assistant1033532692
- Holly Campbell, FNP-BCFamily Nurse Practitioner1225359946
- Trevor Carr, PTPhysical Therapist1124257423
Verify Robert C. Grayson in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersArizona Medical Board
Search for license 21634Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
13% more Medicare Part D claims than the average obstetrics & gynecology physician in 2024
187 Medicare Part D claims for 64 beneficiaries, against an average of 165 among the 28,733 providers of this specialty who prescribed in Part D. Brand-name drugs were 21% of claims.
Most prescribed
- Estradiol61 claims
- Estradiol (Twice Weekly)41 claims
- Clobetasol Propionate16 claims
- Yuvafem12 claims
Source: CMS Medicare Part D Prescribers by Provider and Drug, 2024 (data.cms.gov). Part D covers prescriptions for Medicare patients only; drugs with fewer than 11 claims are not published.
Industry payments in 2024: $373.89
17 payments; by number, the most common kind was food and beverage; the largest payer was Mayne Pharma Commercial LLC. The 21,429 providers of this specialty with any payment received $1,030.61 on average. Payments are reported by manufacturers, not by the provider, and are not a sign of wrongdoing.
Source: CMS Open Payments, program year 2024 (openpaymentsdata.cms.gov); average among providers of this specialty with at least one payment.
Bills Medicare through one group practice
- Southwest Contemporary Women's Care PCPhoenix, AZ
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Robert C. Grayson among 803 obstetrics & gynecology physician records in Arizona
Robert C. Grayson, MD is one of 803 obstetrics & gynecology physician records with a practice address in Arizona. 74% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2006, is newer than 14% of them.
- NPI issued2006 · 14% of these records are older, 52% newer
- In a Medicare fileYes · 74% of these records are
- In the CMS Doctors and Clinicians fileYes · 59% of these records are
- Graduated1990 · median 2005 among the 477 with a school on file
- Record last updated2018 · 49% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207V00000X and a Arizona practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Obstetrics & Gynecology Physician providers in Arizona
There are 803 obstetrics & gynecology physician records in Arizona.
All 803 in Arizona → Every provider in Phoenix → Obstetrics & Gynecology Physician nationwide →
The 8 obstetrics & gynecology physician records with the nearest ZIP codes
- Kimberly Balk, MDPhoenix, AZ 850481902869027
- Charles Boag, D.O.Phoenix, AZ 850481790956027
- Aspen Bradley-Wolfe, M.D.Phoenix, AZ 850481861751067
- Lisa Buschmann, MDPhoenix, AZ 850481396180881
- Julie Davis-Best, MDPhoenix, AZ 850481427024272
- Erin Labesky-Scoggin, D.O.Phoenix, AZ 850481760619191
- Karen Ragaini, M.D.Phoenix, AZ 850481831176270
- Richard Wilson, MDPhoenix, AZ 850481225093370
Common questions
What is Robert C. Grayson, MD's NPI number?
Robert C. Grayson, MD's National Provider Identifier (NPI) is 1649234279, issued on Apr 12, 2006. An NPI identifies a provider in billing; it is not a license.
Where is Robert C. Grayson, MD located?
The NPPES record lists a practice address at 16611 S 40TH St, Phoenix, AZ, 85048. Phone: (480) 785-2100. Providers update this record themselves, so call before visiting.
How can I verify Robert C. Grayson, MD's license?
NPPES lists Arizona license number 21634, as entered by the provider. Search the Arizona Medical Board at https://www.azmd.gov/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
How much does Robert C. Grayson, MD prescribe under Medicare Part D?
In 2024, Robert C. Grayson, MD had 187 Medicare Part D claims for 64 beneficiaries; the average among obstetrics & gynecology physician prescribers was 165. Part D covers Medicare prescriptions only.
Source: CMS National Plan and Provider Enumeration System (NPPES), file of Aug 9, 2026 (NPPES files on CMS.gov); NUCC Health Care Provider Taxonomy. Medicare files from data.cms.gov. An NPI identifies who bills; it is not a license.
Figures on PlainDoctor are read from the federal files each page names (CMS NPPES, Medicare Part D, MIPS, Open Payments; the HHS-OIG exclusion list only as counts) and from Census population estimates, with the file date shown beside them. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of Aug 9, 2026.