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KATHERINE WILLIAMSON D.O.
NPI 1134530546
Obstetrics & Gynecology in Cincinnati, OH

Active since May 20, 2014PECOS EnrolledAccepts Medicare Assignment
95.5/100
CMS Quality Rating
796 OLD STATE ROUTE 74, CINCINNATI, OH 45245(513) 564-2700(513) 297-4469 Get Directions Write a Review

NPPES record last updated: January 8, 2026. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Jan 8, 2026, Mar 24, 2023, Dec 16, 2020 (3 updates tracked since 2020).

About Katherine Williamson D.o. NPPES

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

KATHERINE WILLIAMSON D.O. (NPI 1134530546) is an individual obstetrics & gynecology provider in Cincinnati, Ohio, licensed in Ohio (35C.003185) and active in the NPI registry since May 2014. She is enrolled in Medicare PECOS, is affiliated with Mercy Health-anderson Hospital, and maintains a secondary practice location in Southgate.

NPPES Registry Identity

NPI1134530546
Entity TypeIndividualFemale
Primary Taxonomy207V00000X
Provider Legal NameKATHERINE WILLIAMSONCredential: D.O.
Location Address796 OLD STATE ROUTE 74Cincinnati, OH 45245-1262
Mailing Address796 Old State Route 74 Ste 200Cincinnati, OH 45245-1262 · (513) 564-2700 · Fax (513) 297-4469
Phone(513) 564-2700
Fax(513) 297-4469
Sole ProprietorNo
Medical School CMSOtherGraduated 2014
Enumeration DateMay 20, 2014
Last NPPES UpdateJanuary 8, 20263 updates tracked since enumeration
NPPES CertifiedJanuary 8, 2026
✔ NPI 1134530546 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyObstetrics & GynecologyAllopathic & Osteopathic Physicians
Taxonomy Code207V00000X
License✔ Licensed in OH · 35C.003185
Definition
An obstetrician/gynecologist possesses special knowledge, skills and professional capability in the medical and surgical care of the female reproductive system and associated disorders. This physician serves as a consultant to other physicians and as a primary physician for women.
796 OLD STATE ROUTE 74, Cincinnati, OH 45245
Open in Google Maps ↗

Secondary Practice Location 1

Location 1525 Alexandria Pike Ste 2300Southgate, KY 41071-3290 · Phone (513) 564-2700 · Fax (513) 297-4469

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Anthem Blue Cross and Blue Shield, Antidote Health Plan of Ohio, Inc., CareSource and more.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

Katherine Williamson D.o. 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 ID6002162757
PECOS Enrollment IDI20180710003613, I20230414001769
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

2

Medicare enrollment records show Katherine Williamson reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Mercy Health Physicians Cincinnati Specialty Care LLC
11 mi
Surgery
4600 MCAULEY PL STE 600
Blue Ash, OH 45242
  • Reassigned Medicare billing, Ohio enrollment
  • 481 clinicians in this Medicare group
NPI 1154942795 (888) 696-3541
Christ Hospital Medical Specialists LLC
13 mi
Urology
2139 AUBURN AVE
Cincinnati, OH 45219
  • Reassigned Medicare billing, Kentucky and Ohio enrollments
  • 27 clinicians in this Medicare group
NPI 1124341649 (513) 351-9900

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

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.

Cervical or vaginal cancer screening; pelvic and clinical breast examination G0101
This procedure involves checking for health issues in the lower abdomen and chest area. It helps identify early signs of certain conditions, increasing the chance for successful treatment. It's a routine check-up that's important for maintaining good health.
12 services12 patients

Hospital Affiliations CMS Care Compare 3

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

Mercy Health-Anderson Hospital

Acute Care Hospitals · Cincinnati, OH
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number360001
Location7500 State RoadCincinnati, OH 45255 · Hamilton County
Emergency services Birthing friendly

Christ Hospital

Acute Care Hospitals · Cincinnati, OH
5/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number360163
Location2139 Auburn AvenueCincinnati, OH 45219 · Hamilton County
Emergency services Birthing friendly

Mercy Health - West Hospital

Acute Care Hospitals · Cincinnati, OH
4/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number360234
Location3300 Mercy Health BlvdCincinnati, OH 45211 · Hamilton County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 45245 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
$126.12 typical visit price
range $54.34 – $166.65
Typical copayment $31.53 (range $13.58 – $41.66)
Most-billed visit code 99204
Established Patient
$68.07 typical visit price
range $17.10 – $135.40
Typical copayment $17.01 (range $4.27 – $33.85)
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.

95.5/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored through an Alternative Payment Model
Quality89.59
Promoting Interoperability100
Improvement Activities40

Other Providers at the Same Location NPPES

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

MEDICAL ASSOCIATION OF EASTERN CINCINNATI
Family Medicine
796 OLD STATE ROUTE 74
CINCINNATI, OH 45245
Clermont County (513) 752-5800

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 Williamson's NPI number?

The NPI number for Katherine Williamson is 1134530546. It was assigned to this individual provider in the NPPES registry on May 20, 2014.

Where is Katherine Williamson located?

Katherine Williamson practices at 796 Old State Route 74, Cincinnati, OH 45245. The listed phone number is (513) 564-2700.

What is Katherine Williamson's specialty?

The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.

Is Katherine Williamson enrolled in Medicare?

Yes. Katherine Williamson 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 Williamson's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Katherine Williamson reassigns Medicare benefits to 2 organizations: Mercy Health Physicians Cincinnati Specialty Care LLC (Blue Ash, OH) and Christ Hospital Medical Specialists LLC (Cincinnati, OH). 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 Williamson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Katherine Williamson accept?

Health plans from Anthem Blue Cross and Blue Shield, Antidote Health Plan of Ohio, Inc., CareSource and MedMutual list Katherine Williamson 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 Williamson affiliated with any hospitals?

According to CMS data, Katherine Williamson is affiliated with Mercy Health-Anderson Hospital, Christ Hospital and Mercy Health - West Hospital.

When was this NPI record last updated?

The NPPES record for Katherine Williamson was last updated on January 8, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 9 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.