HAYNER INTERNAL MEDICINE ASSOCIATES, PLLC
NPI 1154914976
Internal Medicine in Howell, MI

Q: What is Hayner Internal Medicine Associates, PLLC's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Active since February 12, 2021

1225 W GRAND RIVER AVE STE 200, HOWELL, MI 48843(517) 304-1245 Get Directions Write a Review

NPPES record last updated: November 24, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Nov 24, 2025, Oct 24, 2022, Feb 12, 2021 (3 updates tracked since 2021).

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About Hayner Internal Medicine Associates, Pllc NPPES

Official registry information on file with the National Plan and Provider Enumeration System.

HAYNER INTERNAL MEDICINE ASSOCIATES, PLLC (NPI 1154914976) is a healthcare organization registered as an internal medicine in Howell, Michigan and active in the NPI registry since February 2021. The organization lists Denise Kozlowski, Practice Manager, as its authorized official.

NPPES Registry Identity

NPI1154914976

Entity TypeOrganization

Primary Taxonomy207R00000X

Legal Business NameHAYNER INTERNAL MEDICINE ASSOCIATES, PLLC

Location Address1225 W GRAND RIVER AVE STE 200Howell, MI 48843-3970

Mailing AddressPo Box 709Pinckney, MI 48169-0709

Phone(517) 304-1245

Organization SubpartNo

Authorized OfficialDenise KozlowskiPractice Manager · (517) 304-1245

Enumeration DateFebruary 12, 2021

Last NPPES UpdateNovember 24, 20253 updates tracked since enumeration

NPPES CertifiedNovember 24, 2025

✔ NPI 1154914976 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians

Taxonomy Code207R00000X

Definition

A physician who provides long-term, comprehensive care in the office and the hospital, managing both common and complex illness of adolescents, adults and the elderly. Internists are trained in the diagnosis and treatment of cancer, infections and diseases affecting the heart, blood, kidneys, joints and digestive, respiratory and vascular systems. They are also trained in the essentials of primary care internal medicine, which incorporates an understanding of disease prevention, wellness, substance abuse, mental health and effective treatment of common problems of the eyes, ears, skin, nervous system and reproductive organs.

1225 W GRAND RIVER AVE STE 200, Howell, MI 48843

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Group Practice 1

Group TaxonomyThis provdier is a business group of one or more individual practitioners, all of who practice with the same area of specialization.193400000X SINGLE SPECIALTY GROUP

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Blue Care Network of Michigan, Blue Cross Blue Shield of Michigan Mutual Insurance Company.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Hayner Internal Medicine Associates, Pllc is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Clinicians Billing Medicare Through This Organization

Medicare enrollment records show 4 clinicians reassign Medicare billing to Hayner Internal Medicine Associates, PLLC, which bills Medicare for the services they deliver. Of these, 3 practice within 10 miles. They are listed nearest first.

Clinicians, nearest first (4)

Chelsea Deluca, NP

Nurse Practitioner

NPI 1255890026

1225 WEST GRAND RIVER AVE #200
Howell, MI 48843

(517) 273-9090

✔ PECOS1.7 mi

James Hayner, M.D.

Internal Medicine

NPI 1902965601

1225 WEST GRAND RIVER AVE SUITE 200
Howell, MI 48843

(517) 273-9090

✔ PECOS✔ Accepts Medicare1.7 mi

Arthur Szyniszewski, MD, FACC

Interventional Cardiology

NPI 1174590640

1225 W GRAND RIVER #200
Howell, MI 48843

(517) 273-9090

✔ PECOS✔ Accepts Medicare1.7 mi

Haley Dontje

Nurse Practitioner

NPI 1255803193

2205 JOLLY RD STE B
Okemos, MI 48864

(517) 347-4085

✔ PECOS27 mi

Source: CMS Revalidation Reassignment List, October 2026 release. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

Frequently Asked Questions NPPES & CMS

Common questions about this NPI record, answered from the official NPPES registry and CMS datasets shown on this page.

What is Hayner Internal Medicine Associates, PLLC's NPI number?

The NPI number for Hayner Internal Medicine Associates, PLLC is 1154914976. It was assigned to this organization in the NPPES registry on February 12, 2021.

Where is Hayner Internal Medicine Associates, PLLC located?

Hayner Internal Medicine Associates, PLLC is located at 1225 W Grand River Ave Ste 200, Howell, MI 48843. The listed phone number is (517) 304-1245.

What is Hayner Internal Medicine Associates, PLLC's specialty?

The primary specialty registered for this NPI is Internal Medicine with taxonomy code 207R00000X.

Is Hayner Internal Medicine Associates, PLLC enrolled in Medicare?

Yes. Hayner Internal Medicine Associates, PLLC is registered in the Medicare PECOS enrollment system.

How many clinicians bill Medicare through Hayner Internal Medicine Associates, PLLC?

According to the CMS Revalidation Reassignment List (October 2026 release), 4 clinicians reassign their Medicare billing to Hayner Internal Medicine Associates, PLLC, in Internal Medicine, Interventional Cardiology and Nurse Practitioner. A reassignment is filed with Medicare on form CMS-855R, signed by both the clinician and the organization, and lets the organization bill Medicare and receive payment for the clinician's services. Of these, 3 practice within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

What insurance does Hayner Internal Medicine Associates, PLLC accept?

Health plans from Blue Care Network of Michigan and Blue Cross Blue Shield of Michigan Mutual Insurance Company list Hayner Internal Medicine Associates, PLLC as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

When was this NPI record last updated?

The NPPES record for Hayner Internal Medicine Associates, PLLC was last updated on November 24, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 10 months ago. If this record has changed at CMS more recently, you can request an on-demand re-check against the live CMS registry, directly from this page.