MARK D LOWDERMILK MD
NPI 1114001823
Obstetrics & Gynecology in Seattle, WA
About Mark D Lowdermilk Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MARK D LOWDERMILK MD (NPI 1114001823) is an individual obstetrics & gynecology provider in Seattle, Washington, licensed in Washington (MD00034023) and active in the NPI registry since October 2006. He is enrolled in Medicare PECOS, is affiliated with Swedish Medical Center / Cherry Hill, and maintains a secondary practice location in Seattle.
NPPES Registry Identity
Specialties & Licenses
Secondary Practice Location 1
Other Identifiers 1
Accepted 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
Mark D Lowdermilk 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.
Medicare Billing Reassignments
2Medicare enrollment records show Mark Lowdermilk reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Seattle, WA 98104
- Reassigned Medicare billing, Washington enrollment
- 129 clinicians in this Medicare group
Seattle, WA 98104
- Reassigned Medicare billing, Washington enrollment
- 1,270 clinicians in this Medicare group
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 3
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.
Hospital Affiliations CMS Care Compare 2
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Swedish Medical Center / Cherry Hill
Acute Care Hospitals · Seattle, WASwedish Medical Center
Acute Care Hospitals · Seattle, WAPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 98104 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.
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.
Other Providers at the Same Location NPPES 12
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
SEATTLE, WA 98104
SEATTLE, WA 98104
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 Mark Lowdermilk's NPI number?
The NPI number for Mark Lowdermilk is 1114001823. It was assigned to this individual provider in the NPPES registry on October 25, 2006.
Where is Mark Lowdermilk located?
Mark Lowdermilk practices at 1229 Madison St Ste 1450, Seattle, WA 98104. The listed phone number is (206) 215-6300.
What is Mark Lowdermilk's specialty?
The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.
Is Mark Lowdermilk enrolled in Medicare?
Yes. Mark Lowdermilk 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 Mark Lowdermilk's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Mark Lowdermilk reassigns Medicare benefits to 2 organizations: Obstetrix Medical Group Of Washington Inc Ps (Seattle, WA) and Swedish Health Services (Seattle, WA). 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 Mark Lowdermilk's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
What insurance does Mark Lowdermilk accept?
Health plans from Ambetter Health, Premera Blue Cross Blue Shield of Alaska and Providence Health Plan list Mark Lowdermilk 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 Mark Lowdermilk affiliated with any hospitals?
According to CMS data, Mark Lowdermilk is affiliated with Swedish Medical Center / Cherry Hill and Swedish Medical Center.
When was this NPI record last updated?
The NPPES record for Mark Lowdermilk was last updated on October 8, 2020. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 6 years 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.
# Mark D Lowdermilk, MD · NPI 1114001823
Obstetrics & Gynecology physician in Seattle, Washington. Individual provider, active in the CMS NPPES registry since October 25, 2006.
## Identity
- **NPI:** 1114001823 (Entity type: Individual)
- **Enumerated:** October 25, 2006
- **Primary specialty:** Obstetrics & Gynecology · taxonomy 207V00000X
- **State license:** MD00034023 (Washington)
- **Sole proprietor:** No
## Practice location
- **Address:** 1229 MADISON ST STE 1450, Seattle, WA 98104-3538
- **Phone:** (206) 215-6300 · **Fax:** (206) 215-6301
## Medicare
- **Medicare:** Enrolled (PECOS); accepts Medicare assignment
- **Ordering & referring:** eligible for Part B labs & imaging, durable medical equipment, home health, power mobility devices
- **Bills Medicare through:** 2 organizations under Medicare reassignment (form CMS-855R): Obstetrix Medical Group Of Washington Inc Ps (NPI 1861599573, Seattle, WA); Swedish Health Services (NPI 1689612954, Seattle, WA) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of Utah School Of Medicine, class of 1994
## Record status
- **NPPES last updated:** October 8, 2020
- **Other identifiers:** Medicaid 8208019 (WA)
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Source: [NPI Profile](https://npiprofile.com/npi/1114001823) · Data from the CMS NPPES public registry.