Katherine Mae Massa, MD
Maternal & Fetal Medicine Physician · Saint Louis, MO
Katherine Mae Massa, MD is a maternal & fetal medicine physician with a practice address in Saint Louis, Missouri, and NPI 1205272341, issued on May 16, 2013. Check the license (Missouri 2017013416, as entered in NPPES) on the Missouri Board of Registration for the Healing Arts; the Medicare figures below come from public CMS files.
- Name
- Katherine Mae Massa
- Credential
- MD
- Primary taxonomy
- Maternal & Fetal Medicine Physician 207VM0101X
- License number
- 2017013416 MO
Self-reported in NPPES; status is on the state search - Practice location
- 4901 Forest Park Ave, Saint Louis, MO 63108
- Phone
- (314) 454-8181
- Enumerated
- May 16, 2013
- Record last updated
- Apr 17, 2025
- Fax
- (314) 747-1429
- Medicaid ID
- 200029660 MO
- Medicare enrollment
- Enrolled (PECOS I20170621001666); accepts Medicare assignment
- Medical or professional school
- Temple University School Of Medicine, 2013
- Entity
- Type 1 · individual
8 nearest maternal & fetal medicine physician records → All 76 in Missouri → Look up another NPI →
Also registered at 4901 Forest Park Ave
A shared address usually means a shared clinic or building; it does not show who employs whom.
- Eva Aagaard, MDGeneral Practice Physician1144286097
- Ashley Ahlbrand, ODOptometrist1215669007
- Muhammad Nabeel Akbar, MDNeuro-ophthalmology Physician1780204149
- Ashley Altman, FNPNurse Practitioner1457882417
- Kelly Amerson, WHNPWomen's Health Nurse Practitioner1205993169
- Milan Anadkat, MDDermatology Physician1639267149
Verify Katherine Mae Massa in five checks
- 1IdentityNPI record in CMS NPPESNPI lookupConfirmed in NPPES
- 2LicenseActive license and public ordersMissouri Board of Registration for the Healing Arts
Search for license 2017013416Check the board - 3Other statesLicenses and actions elsewhereDocInfo (FSMB)Not checked
- 4ExclusionsMedicare and Medicaid bansHHS-OIG exclusion listNot checked
- 5CertificationBoard certificationABMS AOA NCCPA AANPNot checked
The practice group's MIPS final score for 2023 (Medicare payment program): 79.3 of 100
The Merit-based Incentive Payment System score is reported for the practice group, not for one clinician alone. Four categories are weighted into the final score; the average among 454,083 clinicians with a measured score was 83.5.
Source: CMS Quality Payment Program, MIPS performance year 2023, group reporting; category weights for 2023 (qpp.cms.gov).
Industry payments in 2024: $18.98
1 payment: food and beverage; the largest payer was Merck Sharp & Dohme LLC. The 784 providers of this specialty with any payment received $1,252.61 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 3 group practices
- Miracl LLCRolla, MO
- Washington UniversitySaint Louis, MO
- Washington University Physicians IN Illinois IncSaint Louis, MO
Source: CMS Doctors and Clinicians National Downloadable File (the group practices a clinician bills Medicare through) (data.cms.gov).
Katherine Mae Massa among 76 maternal & fetal medicine physician records in Missouri
Katherine Mae Massa, MD is one of 76 maternal & fetal medicine physician records with a practice address in Missouri. 80% of them appear in a Medicare file (Part D prescribing, MIPS, Open Payments or Medicare group billing); this one does. Its NPI, issued in 2013, is newer than 82% of them.
- NPI issued2013 · 82% of these records are older, 14% newer
- In a Medicare fileYes · 80% of these records are
- In the CMS Doctors and Clinicians fileYes · 71% of these records are
- Graduated2013 · median 2008 among the 54 with a school on file
- Record last updated2025 · 42% of these records were not updated in five years or more
Source: CMS NPPES, file of Aug 9, 2026, every record with primary taxonomy 207VM0101X and a Missouri practice address; Medicare files: CMS Part D Prescribers 2024, MIPS 2023, Open Payments 2024, Doctors and Clinicians (data.cms.gov).
Maternal & Fetal Medicine Physician providers in Missouri
There are 76 maternal & fetal medicine physician records in Missouri.
All 76 in Missouri → Every provider in Saint Louis → Maternal & Fetal Medicine Physician nationwide →
The 8 maternal & fetal medicine physician records with the nearest ZIP codes
- Alison Cahill, MDSaint Louis, MO 631081679788038
- Heather Campbell, MDSaint Louis, MO 631081700860350
- Jeffrey Dicke, MDSaint Louis, MO 631081982622437
- Michael Dombrowski, MDSaint Louis, MO 631081841585809
- Antonina Frolova, MDSaint Louis, MO 631081386083194
- Sherri Jackson, MDSaint Louis, MO 631081578590642
- Jeannie Kelly, MDSaint Louis, MO 631081730316761
- George Macones, MDSaint Louis, MO 631081386647345
Common questions
What is Katherine Mae Massa, MD's NPI number?
Katherine Mae Massa, MD's National Provider Identifier (NPI) is 1205272341, issued on May 16, 2013. An NPI identifies a provider in billing; it is not a license.
Where is Katherine Mae Massa, MD located?
The NPPES record lists a practice address at 4901 Forest Park Ave, Saint Louis, MO, 63108. Phone: (314) 454-8181. Providers update this record themselves, so call before visiting.
How can I verify Katherine Mae Massa, MD's license?
NPPES lists Missouri license number 2017013416, as entered by the provider. Search the Missouri Board of Registration for the Healing Arts at https://www.fsmb.org/contact-a-state-medical-board/. The NPPES record confirms identity only; the state search shows license status, expiration and public orders.
What is Katherine Mae Massa, MD's MIPS final score?
The 2023 MIPS final score is 79.3 of 100, reported for the practice group. The average among 454,083 clinicians with a measured score was 83.5.
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.