MICHAELA ONSTAD GRINSFELDER MD
NPI 1437310232
Obstetrics & Gynecology in Houston, TX
About Michaela Onstad Grinsfelder Md NPPES
Official registry information on file with the National Plan and Provider Enumeration System.
MICHAELA ONSTAD GRINSFELDER MD (NPI 1437310232) is an individual obstetrics & gynecology provider in Houston, Texas, licensed in Texas (Q3936) and active in the NPI registry since June 2008. She is enrolled in Medicare PECOS, is affiliated with Harris Health System, and is a graduate of University Of California, Davis School Of Medicine (2008).
NPPES Registry Identity
Specialties & Licenses
Other Names 1
Other Identifiers 1
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
Michaela Onstad Grinsfelder 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 Michaela Grinsfelder reassigns Medicare billing to 2 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.
Houston, TX 77030
- Reassigned Medicare billing, Texas enrollment
- 2,675 clinicians in this Medicare group
Galveston, TX 77555
- Reassigned Medicare billing, Texas enrollment
- 2,222 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
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
Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.
Harris Health System
Acute Care Hospitals · Houston, TXPhysician Visit Costs CMS claims · ZIP area
Typical Medicare office-visit costs in the 77030 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 20
Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.
HOUSTON, TX 77030
HOUSTON, TX 77030
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 Michaela Grinsfelder's NPI number?
The NPI number for Michaela Grinsfelder is 1437310232. It was assigned to this individual provider in the NPPES registry on June 24, 2008. The provider is also known as Michaela Onstad MD.
Where is Michaela Grinsfelder located?
Michaela Grinsfelder practices at 1515 Holcombe Blvd, Houston, TX 77030. The listed phone number is (713) 792-6161.
What is Michaela Grinsfelder's specialty?
The primary specialty registered for this NPI is Obstetrics & Gynecology with taxonomy code 207V00000X.
Is Michaela Grinsfelder enrolled in Medicare?
Yes. Michaela Grinsfelder 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 Michaela Grinsfelder's services?
According to the CMS Revalidation Reassignment List (October 2026 release), Michaela Grinsfelder reassigns Medicare benefits to 2 organizations: Physicians Referral Service (Houston, TX) and Utmb Faculty Group Practice (Galveston, TX). 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 Michaela Grinsfelder's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.
Is Michaela Grinsfelder affiliated with any hospitals?
According to CMS data, Michaela Grinsfelder is affiliated with Harris Health System.
When was this NPI record last updated?
The NPPES record for Michaela Grinsfelder was last updated on April 21, 2023. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 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.
# Michaela Onstad Grinsfelder, MD · NPI 1437310232
Obstetrics & Gynecology physician in Houston, Texas. Individual provider, active in the CMS NPPES registry since June 24, 2008.
## Identity
- **NPI:** 1437310232 (Entity type: Individual)
- **Enumerated:** June 24, 2008
- **Primary specialty:** Obstetrics & Gynecology · taxonomy 207V00000X
- **State license:** Q3936 (Texas)
- **Sole proprietor:** No
## Practice location
- **Address:** 1515 HOLCOMBE BLVD, Houston, TX 77030-4000
- **Phone:** (713) 792-6161
## 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): Physicians Referral Service (NPI 1073574810, Houston, TX); Utmb Faculty Group Practice (NPI 1942241146, Galveston, TX) · CMS Revalidation Reassignment List, October 2026 release
- **Medical school:** University Of California, Davis School Of Medicine, class of 2008
## Record status
- **NPPES last updated:** April 21, 2023
- **Other identifiers:** Medicaid 346621101 (TX)
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Source: [NPI Profile](https://npiprofile.com/npi/1437310232) · Data from the CMS NPPES public registry.