DR. ONYEKACHI CHIKA HAMMACK M.D.
NPI 1720348287
Pediatrics in Mt Pleasant, MI

Q: What is Onyekachi Hammack's NPI number?

The NPI number for Onyekachi Hammack is 1720348287. It was assigned to this individual provider in the NPPES registry on May 17, 2012. The provider is also known as Dr. Chika Hammack M.D..

Q: What is Onyekachi Hammack's specialty?

The primary specialty registered for this NPI is Pediatrics with taxonomy code 208000000X.

Q: When was this NPI record last updated?

The NPPES record for Onyekachi Hammack was last updated on February 13, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 20 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.

Active since May 17, 2012PECOS Enrolled

2790 HEALTH PKWY, MT PLEASANT, MI 48858(989) 779-5270 Get Directions Write a Review

NPPES record last updated: February 13, 2025. Verified against the NPPES registry weekly; last sync: October 18, 2026.

Record update history: Feb 13, 2025, Aug 27, 2018 (2 updates tracked since 2018).

On this page

About Dr. Onyekachi Chika Hammack M.d. NPPES

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

DR. ONYEKACHI CHIKA HAMMACK M.D. (NPI 1720348287) is an individual pediatrics provider in Mt Pleasant, Michigan, licensed in Michigan (4301109582) and active in the NPI registry since May 2012. She is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1720348287

Entity TypeIndividualFemale

Primary Taxonomy208000000X

Provider Legal NameDR. ONYEKACHI CHIKA HAMMACKCredential: M.D.

Location Address2790 HEALTH PKWYMt Pleasant, MI 48858-6934

Mailing Address2935 Health Pkwy, Isabella Citizens For HealthMt Pleasant, MI 48858-8931 · (989) 779-5270

Phone(989) 779-5270

Sole ProprietorYes

Enumeration DateMay 17, 2012

Last NPPES UpdateFebruary 13, 20252 updates tracked since enumeration

NPPES CertifiedFebruary 13, 2025

✔ NPI 1720348287 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatricsAllopathic & Osteopathic Physicians

Taxonomy Code208000000X

License✔ Licensed in MI · 4301109582

Definition

A pediatrician is concerned with the physical, emotional and social health of children from birth to young adulthood. Care encompasses a broad spectrum of health services ranging from preventive healthcare to the diagnosis and treatment of acute and chronic diseases. A pediatrician deals with biological, social and environmental influences on the developing child, and with the impact of disease and dysfunction on development.

2790 HEALTH PKWY, Mt Pleasant, MI 48858

Open in Google Maps ↗

Other Names 1

Professional Name (2)Dr. Chika Hammack M.d.

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Buckeye Health Plan, Ambetter from Meridian, Ambetter Health and more.Insurance ›

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, billing reassignment, and ordering and referring status from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Onyekachi Chika Hammack M.d. is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Eligible to Order & Refer✔ Part B Labs & Imaging✔ Durable Medical Equipment✔ Home Health Agency✔ Power Mobility DevicesPer the CMS Ordering and Referring file. Eligibility means Medicare pays claims that this provider orders or refers for these categories.

Medicare Billing Reassignment

Medicare enrollment records show Onyekachi Hammack reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Isabella Citizens For Health Inc

Same address

Family Medicine

2790 HEALTH PKWY
Mt Pleasant, MI 48858

Reassigned Medicare billing, Michigan enrollment
31 clinicians in this Medicare group

NPI 1245610302 (989) 953-5320

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

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 48858 ZIP code area, from fee-for-service claims. These are area statistics, not this provider’s prices; actual charges vary by service and coverage.

New Patient

$84.74 typical visit price

range $54.34 – $166.68

Typical copayment $21.18 (range $13.58 – $41.67)

Most-billed visit code 99203

Established Patient

$96.44 typical visit price

range $17.09 – $135.40

Typical copayment $24.11 (range $4.27 – $33.85)

Most-billed visit code 99214

Amounts reflect what Medicare beneficiaries in this ZIP area are typically charged for office visits. Patients with other coverage should check their individual plans.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

Reported Quality Measures

Appropriate Treatment for Children with Upper Respiratory Infection (URI)

Percentage of children 3 months-18 years of age who were diagnosed with upper respiratory infection (URI) and were not dispensed an antibiotic prescription on or three days after the episode

98%466 patients

Closing the Referral Loop: Receipt of Specialist Report

Percentage of patients with referrals, regardless of age, for which the referring provider receives a report from the provider to whom the patient was referred

97%87 patients5/55-star benchmark: 95%

Preventive Care and Screening: Influenza Immunization

Percentage of patients aged 6 months and older seen for a visit between October 1 and March 31 who received an influenza immunization OR who reported previous receipt of an influenza immunization

48%438 patients3/55-star benchmark: 88%

Preventive Care and Screening: Screening for Depression and Follow-Up Plan

Percentage of patients aged 12 years and older screened for depression on the date of the encounter using an age appropriate standardized depression screening tool AND if positive, a follow-up plan is documented on the date of the positive screen

50%110 patients3/55-star benchmark: 96%

Weight Assessment and Counseling for Nutrition and Physical Activity for Children and Adolescents

Percentage of patients 3-17 years of age who had an outpatient visit with a Primary Care Physician (PCP) or Obstetrician/Gynecologist (OB/GYN) and who had evidence of the following during the measurement period. Three rates are reported.

Patients nutrition: 13% · 578 patients

Patients physicalActivity: 17% · 578 patients

94%578 patients

Providers report different measures because they deliver different services; reporting more or less information is not a reflection of quality. Star ratings appear only where CMS assigned them.

Other Providers at the Same Location NPPES 20

Providers registered at the same practice address, or within the immediate area, according to the NPPES registry.

PATRICIA JACKSON

Physician Assistant

2790 HEALTH PKWY
MOUNT PLEASANT, MI 48858

Isabella County (989) 953-5320

JAMIE SMITH

Physician Assistant

2790 HEALTH PKWY
MT PLEASANT, MI 48858

Isabella County (989) 953-5320

TARA LYNN HERALD

Community Health Worker

2790 HEALTH PKWY
MT PLEASANT, MI 48858

Isabella County (989) 953-5320

ALESHA RUTH HALL TLLP

Psychologist (Clinical)

2790 HEALTH PKWY
MOUNT PLEASANT, MI 48858

Isabella County (989) 953-5320

DENELLE MOHAMMED MD

Family Medicine

2790 HEALTH PKWY
MOUNT PLEASANT, MI 48858

Isabella County (989) 953-5320

ISABELLA CITIZENS FOR HEALTH, INC.

Clinic/Center (Federally Qualified Health Center (FQHC))

2790 HEALTH PKWY
MT PLEASANT, MI 48858

Isabella County (989) 953-5320

SHAMEL AMIN M.D.

Pediatrics (Pediatric Gastroenterology)

2790 HEALTH PKWY
MT PLEASANT, MI 48858

Isabella County (989) 779-5270

DEREK MATTHEW GAGER

Community Health Worker

2790 HEALTH PKWY
MT PLEASANT, MI 48858

Isabella County (989) 953-5320

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 Onyekachi Hammack's NPI number?

The NPI number for Onyekachi Hammack is 1720348287. It was assigned to this individual provider in the NPPES registry on May 17, 2012. The provider is also known as Dr. Chika Hammack M.D..

Where is Onyekachi Hammack located?

Onyekachi Hammack practices at 2790 Health Pkwy, Mt Pleasant, MI 48858. The listed phone number is (989) 779-5270.

What is Onyekachi Hammack's specialty?

The primary specialty registered for this NPI is Pediatrics with taxonomy code 208000000X.

Is Onyekachi Hammack enrolled in Medicare?

Yes. Onyekachi Hammack is registered in the Medicare PECOS enrollment system.

Which organization bills Medicare for Onyekachi Hammack's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Onyekachi Hammack reassigns Medicare benefits to Isabella Citizens For Health Inc (Mt Pleasant, MI). The 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 Onyekachi Hammack's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Onyekachi Hammack accept?

Health plans from Ambetter Health, Ambetter from Buckeye Health Plan, Ambetter from Meridian, Blue Care Network of Michigan and Blue Cross Blue Shield of Michigan Mutual Insurance Company and 1 other insurer list Onyekachi Hammack 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 Onyekachi Hammack was last updated on February 13, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 20 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.