What is Frederick Hernaez's NPI number?

Frederick Hernaez's National Provider Identifier (NPI) is 1205498227, a unique 10-digit ID issued by CMS for use in standard healthcare transactions.

What is Frederick Hernaez's specialty?

Frederick Hernaez is listed in the NPPES registry with a primary specialty of Internal Medicine Physician (Allopathic & Osteopathic Physicians).

Where is Frederick Hernaez located?

Frederick Hernaez's practice location on file with NPPES is 1000 N Oak Ave, Marshfield, WI 54449-5703.

What is Frederick Hernaez's phone number?

The practice phone number listed in the NPPES registry for Frederick Hernaez is (715) 387-5511.

Does Frederick Hernaez accept Medicare?

Frederick Hernaez is approved to bill Medicare according to CMS PECOS enrollment data (2026.04.01). Confirm current participation with the provider before scheduling.

Is Frederick Hernaez's NPI active?

Yes — Frederick Hernaez's NPI (1205498227) is active in the NPPES registry as of the last update on 2024-04-23.

IndividualActiveAccepts Medicare

Frederick Hernaez, MD

NPI 1205498227 · Internal Medicine Physician · Marshfield, WI

Enrolled with Medicare as Practitioner - Internal Medicine · source: CMS PECOS Public Provider Enrollment (2026.04.01)

Frederick Hernaez, MD is a Internal Medicine Physician provider in Marshfield, WI (NPI 1205498227).

Provider details

NPI number: 1205498227
Entity type: Individual
Primary specialty: Internal Medicine PhysicianAllopathic & Osteopathic Physicians
Credential: MD
Sex: Male
Sole proprietor: No
License: 74654 (WI)

Specialties & taxonomies

Internal Medicine PhysicianPrimary207R00000XLicense 74654 (WI)
Allopathic & Osteopathic Physicians

Profile Score

Basic profile(49/100 index)

A profile completeness & documented-activity index — NOT a quality, outcomes, or patient-satisfaction rating.

Registry tenure28% of score
6 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
179 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)
Established Patient Office Or Other Outpatient Visit With Moderate Level of Decision Making, If Using Time, 30 Minutes Or More99214	85	$90
Established Patient Office Or Other Outpatient Visit With Low Level OD Decision Making, If Using Time, 20 Minutes Or More99213	81	$61
New Patient Office Or Other Outpatient Visit With Moderate Level of Medical Decision Making, If Using Time, 45 Minutes Or More99204	13	$123

Typical Medicare-allowed amounts for these services range $61–$123 (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 · 66 distinct drugs on file.

Drug	Part D claims (2024)	Beneficiaries
Atorvastatin Calcium	243	85
Levothyroxine Sodium	123	39
Lisinopril	112	36
Gabapentin	107	33
Amlodipine Besylate	100	39
Omeprazole	96	33
Pantoprazole Sodium

Practice location

1000 N Oak Ave

Marshfield, WI 54449-5703

Phone: (715) 387-5511

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Mailing address