Karen Underhill, ANP-C
NPI 1679590285 · Nurse Practitioner · Ann Arbor, MI
Enrolled with Medicare as Practitioner - Nurse Practitioner · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Karen Underhill, ANP-C is a Nurse Practitioner provider in Ann Arbor, MI (NPI 1679590285).
Provider details
- NPI number
- 1679590285
- Entity type
- Individual
- Primary specialty
- Nurse PractitionerPhysician Assistants & Advanced Practice Nursing Providers
- Credential
- ANP-C
- Sex
- Female
- Sole proprietor
- No
- License
- 4704146521 (MI)
Specialties & taxonomies
Physician Assistants & Advanced Practice Nursing Providers
Physician Assistants & Advanced Practice Nursing Providers
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
19 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
1 documented practice location
- Medicare service volume (vs. specialty peers)28% of score
324 Medicare services, 2024 (ranked within specialty)
Medicare volume is ranked against active providers in the same specialty. Signals a provider has no public data for (e.g. Medicare claims) are left out of the score entirely — never counted as zero — so providers without that data are not penalized. See the full formula and weights in our methodology.
What this provider does (Medicare)
Based on Medicare fee-for-service claims, 2024; not all care is captured.
| Service (HCPCS) | Medicare services | Typical Medicare-allowed (2024) |
|---|---|---|
| Subsequent Nursing Facility Care With Moderate Level of Medical Decision Making, Per Day, If Using Time, at Least 30 Minutes99309 | 202 | $91 |
| Subsequent Nursing Facility Care With High Level of Medical Decision Making, Per Day, If Using Time, at Least 45 Minutes99310 | 77 | $131 |
| Nursing Facility Discharge Management, More Than 30 Minutes99316 | 45 | $110 |
Typical Medicare-allowed amounts for these services range $91–$131 (2024). The Medicare-allowed amount is what Medicare recognizes for a service under fee-for-service — a reference figure for 2024, not a price quote and not what you would be billed. Medicare Part B covers roughly an eighth of all NPIs (65+ skew); services with fewer than 11 beneficiaries are suppressed by CMS. Source: CMS Medicare Physician & Other Practitioners, by Provider & Service.
What this provider prescribes (Medicare Part D)
Top drugs by Medicare Part D claim volume, 2024 · 17 distinct drugs on file.
| Drug | Part D claims (2024) | Beneficiaries |
|---|---|---|
| Atorvastatin Calcium | 31 | 25 |
| Omeprazole | 24 | 17 |
| Amlodipine Besylate | 24 | 17 |
| Gabapentin | 23 | 21 |
| Lisinopril | 23 | 12 |
| Escitalopram Oxalate | 22 | — |
| Levothyroxine Sodium |
Practice location
Mailing address
Registry dates
- Enumerated
- 2006-07-17
- Last updated
- 2015-02-09
Frequently asked questions
- What is Karen Underhill's NPI number?
- Karen Underhill's National Provider Identifier (NPI) is 1679590285, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Karen Underhill's specialty?
- Karen Underhill is listed in the NPPES registry with a primary specialty of Nurse Practitioner (Physician Assistants & Advanced Practice Nursing Providers).
- Where is Karen Underhill located?
- Karen Underhill's practice location on file with NPPES is 1200 Earhart Rd, Ann Arbor, MI 48105-2768.
- What is Karen Underhill's phone number?
- The practice phone number listed in the NPPES registry for Karen Underhill is (734) 769-0177.
- Does Karen Underhill accept Medicare?
- Karen Underhill is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Karen Underhill's NPI active?
- Yes — Karen Underhill's NPI (1679590285) is active in the NPPES registry as of the last update on 2015-02-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.