1. Home
  2. Directory
  3. Missouri
  4. Saint Louis
  5. Obstetrics Gynecology
  6. NPI Profile

DR. KATHERINE MAE MASSA MD
NPI 1205272341
Obstetrics & Gynecology - Maternal & Fetal Medicine in Saint Louis, MO

Active since May 16, 2013PECOS EnrolledAccepts Medicare Assignment
92.39/100
CMS Quality Rating
4901 FOREST PARK AVE, DIV OBGYN MFM AND US, STE 710, SAINT LOUIS, MO 63108(314) 454-8181(314) 747-1429 Get Directions Write a Review

NPPES record last updated: April 17, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Apr 25, 2024, Apr 10, 2024, Nov 15, 2021 and 2 more (5 updates tracked since 2020).

About Dr. Katherine Mae Massa Md NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

DR. KATHERINE MAE MASSA MD (NPI 1205272341) is an individual maternal & fetal medicine provider in Saint Louis, Missouri, licensed in Missouri (2017013416) and active in the NPI registry since May 2013. She is enrolled in Medicare PECOS, is affiliated with Phelps County Regional Medical Center, and is a graduate of Temple University School Of Medicine (2013).

NPPES Registry Identity

NPI1205272341
Entity TypeIndividualFemale
Primary Taxonomy207VM0101X
Provider Legal NameDR. KATHERINE MAE MASSACredential: MD
Location Address4901 FOREST PARK AVE, DIV OBGYN MFM AND US, STE 710Saint Louis, MO 63108-1495
Mailing AddressPo Box 7412011Chicago, IL 60674-2011 · (314) 454-8181 · Fax (314) 747-1429
Phone(314) 454-8181
Fax(314) 747-1429
Sole ProprietorNo
Medical School CMSTemple University School Of MedicineGraduated 2013
Enumeration DateMay 16, 2013
Last NPPES UpdateApril 17, 20255 updates tracked since enumeration
✔ NPI 1205272341 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyObstetrics & Gynecology · Maternal & Fetal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207VM0101X
License✔ Licensed in MO · 2017013416
Definition
An obstetrician/gynecologist who cares for, or provides consultation on, patients with complications of pregnancy. This specialist has advanced knowledge of the obstetrical, medical and surgical complications of pregnancy and their effect on both the mother and the fetus. The specialist also possesses expertise in the most current diagnostic and treatment modalities used in the care of patients with complicated pregnancies.
4901 FOREST PARK AVE, Saint Louis, MO 63108
Open in Google Maps ↗

Other Identifiers 1

Medicaid200029660MO

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Cox HealthPlans, UnitedHealthcare.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Katherine Mae Massa Md is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID3375846140
PECOS Enrollment IDI20170621001666, I20200910000273
Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignments

3

Medicare enrollment records show Katherine Massa reassigns Medicare billing to 3 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Washington University Physicians In Illinois, Inc
Same address
Multi-Specialty
4901 FOREST PARK AVE STE 341
Saint Louis, MO 63108
  • Reassigned Medicare billing, Illinois and Missouri enrollments
  • 530 clinicians in this Medicare group
NPI 1457203135 (314) 454-8181
Washington University
0.4 mi
Multi-Specialty
660 S EUCLID AVE
Saint Louis, MO 63110
  • Reassigned Medicare billing, Missouri enrollment
  • 105 clinicians in this Medicare group
NPI 1760422265 (314) 362-4964
Miracl, LLC
95 mi
Multi-Specialty
1000 W 10TH ST
Rolla, MO 65401
  • Reassigned Medicare billing, Missouri enrollment
  • 347 clinicians in this Medicare group
NPI 1205304300 (573) 364-9000

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Areas of Expertise CMS Part B claims 2

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Ultrasound scan of uterus, ovaries, tubes, cervix and pelvic area through vagina 76830
An ultrasound scan of the lower abdominal region is a safe, non-invasive procedure that uses sound waves to create images of internal structures. This helps in checking the health of reproductive organs and detecting any abnormalities. The scan is done via a small probe inserted into the body.
20 services19 patients
Complete ultrasound scan of pelvis 76856
A complete ultrasound scan of the pelvis is a safe, non-invasive imaging procedure. It uses sound waves to create pictures of your lower abdomen area, helping doctors to evaluate and diagnose any potential issues. It's painless and usually takes about 30 minutes.
17 services17 patients

Hospital Affiliations CMS Care Compare 2

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Phelps County Regional Medical Center

Acute Care Hospitals · Rolla, MO
3/5 CMS rating
OwnershipGovernment - Local
CMS Certification Number260017
Location1000 W 10th StRolla, MO 65401 · Phelps County
Emergency services Birthing friendly

Barnes Jewish Hospital

Acute Care Hospitals · Saint Louis, MO
4/5 CMS rating
OwnershipVoluntary non-profit - Other
CMS Certification Number260032
LocationOne Barnes-Jewish Hospital PlazaSaint Louis, MO 63110 · St. Louis City County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 63108 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient
$128.28 typical visit price
range $55.65 – $169.38
Typical copayment $32.07 (range $13.91 – $42.34)
Most-billed visit code 99204
Established Patient
$69.50 typical visit price
range $17.76 – $137.92
Typical copayment $17.37 (range $4.44 – $34.48)
Most-billed visit code 99213
Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

92.39/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality97.81
Promoting Interoperability100
Improvement Activities40
Cost70.26

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

DR. ERIN LEIGH DYER MD
General Practice
4901 FOREST PARK AVE, DIV IM GENERAL MED, STE 241
SAINT LOUIS, MO 63108
St. Louis City (314) 362-5060
DR. NICHOLE GALLEGOS ZEHNDER MD
General Practice
4901 FOREST PARK AVE, DIV IM GENERAL MED, STE 241
SAINT LOUIS, MO 63108
St. Louis City (314) 362-5060
MRS. NANCY J CIBULKA WHNP
Nurse Practitioner (Family)
4901 FOREST PARK AVE, STE 341
SAINT LOUIS, MO 63108
St. Louis City (314) 454-7882
DR. MARCIA J MCCABE PSYD
Psychologist
4901 FOREST PARK AVE, DEPT PSYCHIATRY, STE 441
SAINT LOUIS, MO 63108
St. Louis City (314) 286-1700
WASHINGTON UNIVERSITY
Clinic/Center (Multi-Specialty)
4901 FOREST PARK AVE
SAINT LOUIS, MO 63108
St. Louis City (314) 362-3937
DR. JING-WEI HUANG MD
Ophthalmology (Cornea and External Diseases Specialist)
4901 FOREST PARK AVE, DEPT OPHTHALMOLOGY, 6TH FL
SAINT LOUIS, MO 63108
St. Louis City (314) 362-3937
DR. DAVID L EISENBERG MD
Obstetrics & Gynecology (Gynecology)
4901 FOREST PARK AVE, DIV OBGYN FAMILY PLANNING, STE 710
SAINT LOUIS, MO 63108
St. Louis City (314) 362-4211
NICHOLAS RICHARD LEVERGOOD MD
Ophthalmology (Ophthalmic Plastic and Reconstructive Surgery)
4901 FOREST PARK AVE, DEPT OPHTHALMOLOGY, 6TH FL
SAINT LOUIS, MO 63108
St. Louis City (314) 362-3937

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Katherine Massa's NPI number?

The NPI number for Katherine Massa is 1205272341. It was assigned to this individual provider in the NPPES registry on May 16, 2013.

Where is Katherine Massa located?

Katherine Massa practices at 4901 Forest Park Ave Div Obgyn Mfm And Us, Ste 710, Saint Louis, MO 63108. The listed phone number is (314) 454-8181.

What is Katherine Massa's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology, specializing in Maternal & Fetal Medicine, with taxonomy code 207VM0101X.

Is Katherine Massa enrolled in Medicare?

Yes. Katherine Massa is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organizations bill Medicare for Katherine Massa's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Katherine Massa reassigns Medicare benefits to 3 organizations: Washington University Physicians In Illinois, Inc (Saint Louis, MO), Washington University (Saint Louis, MO) and Miracl, LLC (Rolla, MO). Each reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for Katherine Massa's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Katherine Massa accept?

Health plans from Cox HealthPlans and UnitedHealthcare list Katherine Massa as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Katherine Massa affiliated with any hospitals?

According to CMS data, Katherine Massa is affiliated with Phelps County Regional Medical Center and Barnes Jewish Hospital.

When was this NPI record last updated?

The NPPES record for Katherine Massa was last updated on April 17, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 18 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.