What is Nicholas Hartog's specialty?

Nicholas Hartog (NPI 1669766325) is a Medicare-billing provider whose primary specialty is Allergy/ Immunology in Grand Rapids, MI.

Where does Nicholas Hartog practice?

Nicholas Hartog practices in Grand Rapids, MI, based on the location reported in the CMS Medicare provider datasets for NPI 1669766325.

How much does Medicare pay Nicholas Hartog?

Nicholas Hartog (NPI 1669766325) received approximately $9K in total Medicare Part B payments, serving 59 beneficiaries, per the CMS Medicare Physician & Other Practitioners dataset.

PROVIDER PROFILE · NPI 1669766325

Nicholas HartogM.D.

PRACTICESPECTRUM HEALTH PRIMARY CARE PARTNERSSee all providers at this practice →

Allergy/ ImmunologyGrand Rapids, MII

MEDICARE UTILIZATION · PART B · 2024

Total beneficiaries

Unique beneficiaries

—

Total services

112

Distinct HCPCS

Medicare payment

$8K

Peer benchmark

Total Medicare services vs. 124 Allergy/ Immunology providers in MI — bottom quintile (cohort median 2,158).

PRESCRIBING · PART D · 2024

Total Rx claims

263

Beneficiaries

—

Total drug cost

$1.6M

Distinct drugs

Brand share

43.3%

Top prescribed drugs

Montelukast Sodium51 claims

Albuterol Sulfate28 claims

Azelastine Hcl27 claims

Fluticasone Propionate24 claims

Dupilumab21 claims

QUALITY · MIPS · 2024

No data available for this provider in 2024.

INDUSTRY PAYMENTS · OPEN PAYMENTS · 2025

Total received

$98K

Payment records

174

By payment type

Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$66K

Consulting Fee$19K

Travel and Lodging$10K

Food and Beverage$3K

Education$16

Top paying entities

Compensation for services other than consulting, including serving as faculty or as a speaker at a venue other than a continuing education program$66K

Consulting Fee$19K

Travel and Lodging$10K

Food and Beverage$3K

Education$16

REFERRAL NETWORK

Where Nicholas Hartog's patients come from & go

Directional shared-patient flow from Medicare claims — who sends patients to this provider (inbound) and where this provider's patients go next (outbound). 7 inbound referrers · 0 outbound destinations.

Receives referrals from

Inbound — who sends patients here

Physician	Patients	Visits
MISSOURI BAPTIST MEDICAL CENTER	62	83
NPI 1407879562	27	47
NPI 1083791529	17	23
Christopher Thornton Diagnostic Radiology · Saint Louis, MO	16	21
MOSHER, AMY	11	14
Melissa Kiefer-Mcelwrath Nurse Practitioner · Saint Louis, MO	11	13
Jamie Colonnello Diagnostic Radiology · Fort Collins, CO	11	16

Refers patients to

Outbound — where patients go next

No outbound pairs above the suppression threshold.

Source: CMS Physician Shared Patient Patterns (30-day window, Medicare FFS). Direction = a beneficiary seen by the first provider, then the second, within 30 days; a proxy for referral, not a documented referral. Pairs with fewer than 11 shared beneficiaries are suppressed.

CROSS-REFERENCE

Related data on other Healthparse brands

ProviderScore

OIG/SAM exclusion screening, sanctions history

Healthparse Signals

Monitor this provider for changes — dated NPI change events