Mariko Hagiwara, M.D.
NPI 1679899157 · Hospitalist Physician · Iowa City, IA
Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)
Mariko Hagiwara, M.D. is a Hospitalist Physician provider in Iowa City, IA (NPI 1679899157).
Provider details
- NPI number
- 1679899157
- Entity type
- Individual
- Primary specialty
- Hospitalist PhysicianAllopathic & Osteopathic Physicians
- Credential
- M.D.
- Sex
- Female
- Sole proprietor
- No
- License
- MD-44493 (IA)
Specialties & taxonomies
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Allopathic & Osteopathic Physicians
Profile Score
A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.
- Registry tenure28% of score
16 yrs in NPPES registry
- Profile completeness28% of score
100% of core fields populated
- Practice footprint17% of score
3 documented practice locations
- Medicare service volume (vs. specialty peers)28% of score
379 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 Hospital Care With Moderate Levelof Medical Decision Making, If Using Time, at Least 35 Minutes99232 | 295 | $73 |
| Initial Hospital Care With Straightforward Or Low-Level Medical Decision Making, If Using Time, at Least 55 Minutes99222 | 84 | $120 |
Typical Medicare-allowed amounts for these services range $73–$120 (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.
Practice location
Mailing address
Additional practice locations (2)
- 701 W Forevergreen RdNorth Liberty, IA 52317-9848Phone: (319) 356-4019Fax: (319) 356-3949
- 520 Madison Oak DrSan Antonio, TX 78258-3913Phone: (210) 297-4000
Registry dates
- Enumerated
- 2010-04-09
- Last updated
- 2025-04-09
- Certified
- 2025-04-09
Frequently asked questions
- What is Mariko Hagiwara's NPI number?
- Mariko Hagiwara's National Provider Identifier (NPI) is 1679899157, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.
- What is Mariko Hagiwara's specialty?
- Mariko Hagiwara is listed in the NPPES registry with a primary specialty of Hospitalist Physician (Allopathic & Osteopathic Physicians).
- Where is Mariko Hagiwara located?
- Mariko Hagiwara's practice location on file with NPPES is 200 Hawkins Dr, Iowa City, IA 52242-1009.
- What is Mariko Hagiwara's phone number?
- The practice phone number listed in the NPPES registry for Mariko Hagiwara is (319) 356-1616.
- Does Mariko Hagiwara accept Medicare?
- Mariko Hagiwara is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.
- Is Mariko Hagiwara's NPI active?
- Yes — Mariko Hagiwara's NPI (1679899157) is active in the NPPES registry as of the last update on 2025-04-09.
Source: CMS NPPES Data Dissemination (June 2026). NPI Central is not affiliated with CMS. Data is provided as-is from the public registry.