Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of August 10, 2026.
NPIDirectory

Isabella Marla Grumbach, MD

Individual provider Internal Medicine Physician · NPI 1730108879

Isabella Marla Grumbach, MD practises Internal Medicine in Iowa City, Iowa. Qualified in 1992, 34 years ago. Practices with Ou Health Partners Inc, a 1,167-clinician group and accepts Medicare assignment. Licensed in Iowa.

Years since qualifying
34
Licensed in
IA
In the registry since
2006
Specialties on file
2
What do these letters mean?
MD — Doctor of Medicine
A physician who completed allopathic medical school.

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Practice location Address checks out

200 Hawkins Dr
Iowa City, IA 52242-1009 Not confirmed with CMS for 18 years — call before visiting
Phone: (319) 356-2706
Fax: (319) 353-6343
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Cardiovascular Disease Physician (primary) Taxonomy 207RC0000X · Licence 36622 (IA)
Internal Medicine Physician Taxonomy 207R00000X · Licence 36622 (IA)

Record details

NPI number1730108879
Entity typeIndividual (Type 1)
GenderFemale
Credentials MD
Sole proprietorNo
NPI enumeratedJuly 19, 2006
Last updated in NPPESJune 18, 2008

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyINTERNAL MEDICINE
Also practisesCARDIOVASCULAR DISEASE (CARDIOLOGY)
Medical schoolOTHER
Graduated 1992 (34 years in practice)
Group practice Ou Health Partners Inc — 1167 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients20
Services billed 38 a service is one billed item, such as a visit, a test or a procedure
Average patient age74

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at Ou Health Partners Inc

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 1167 clinicians in the practice; 12 are shown here.

Other providers in Iowa City