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DR. NATHANIEL A. J. RATNASAMY M. D.
NPI 1558363317
Internal Medicine - Infectious Disease in Findlay, OH

Active since August 11, 2005PECOS EnrolledAccepts Medicare Assignment
67.77/100
CMS Quality Rating
1818 CHAPEL DR STE C, FINDLAY, OH 45840(419) 429-7637(419) 429-7641 Get Directions Write a Review

NPPES record last updated: July 11, 2018. Verified against the NPPES registry weekly; last sync: November 08, 2026.

About Dr. Nathaniel A. J. Ratnasamy M. D. NPPES

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

DR. NATHANIEL A. J. RATNASAMY M. D. (NPI 1558363317) is an individual infectious disease provider in Findlay, Ohio, licensed in Ohio (35082006) and active in the NPI registry since August 2005. He is enrolled in Medicare PECOS, is affiliated with Mercy Health - Tiffin Hospital, and is a graduate of University Of North Dakota School Of Medicine (1989).

NPPES Registry Identity

NPI1558363317
Entity TypeIndividualMale
Primary Taxonomy207RI0200X
Provider Legal NameDR. NATHANIEL A. J. RATNASAMYCredential: M. D.
Location Address1818 CHAPEL DR STE CFindlay, OH 45840
Mailing Address1818 Chapel Dr Ste CFindlay, OH 45840-1344 · (419) 429-7637 · Fax (419) 429-7641
Phone(419) 429-7637
Fax(419) 429-7641
Sole ProprietorNo
Medical School CMSUniversity Of North Dakota School Of MedicineGraduated 1989
Enumeration DateAugust 11, 2005
Last NPPES UpdateJuly 11, 2018
✔ NPI 1558363317 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Infectious DiseaseAllopathic & Osteopathic Physicians
Taxonomy Code207RI0200X
License✔ Licensed in OH · 35082006
Definition
An internist who deals with infectious diseases of all types and in all organ systems. Conditions requiring selective use of antibiotics call for this special skill. This physician often diagnoses and treats AIDS patients and patients with fevers which have not been explained. Infectious disease specialists may also have expertise in preventive medicine and travel medicine.
1818 CHAPEL DR STE C, Findlay, OH 45840
Open in Google Maps ↗

Other Identifiers 2

Medicaid2361215OH
OtherE91939OH · Upin

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 and accepts Medicare assignment

Dr. Nathaniel A. J. Ratnasamy M. D. is registered in PECOS and agrees to accept the Medicare-approved amount as full payment. Medicare patients are not billed beyond the standard deductible and coinsurance.

PECOS PAC ID7214973353
PECOS Enrollment IDI20111212000723
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 Nathaniel Ratnasamy reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

Specialty Physicians Of Blanchard Valley LLC
0.2 mi
Cardiovascular Disease
1900 S MAIN ST
Findlay, OH 45840
  • Reassigned Medicare billing, Ohio enrollment
  • 120 clinicians in this Medicare group
NPI 1689835415 (419) 423-4500

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

Areas of Expertise CMS Part B claims 8

Services this provider delivered to Medicare fee-for-service patients, from the CMS Medicare utilization data. Higher counts generally reflect more experience with a service; care delivered outside Medicare is not included.

Subsequent hospital care with moderate levelof medical decision making, if using time, at least 35 minutes 99232
Follow-up hospital inpatient care involves daily check-ups while you're admitted in the hospital. Typically, a healthcare provider spends about 25 minutes each day reviewing your condition, adjusting treatment if needed, and answering any questions you might have.
331 services108 patients
Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
285 services144 patients
Insertion of needle into vein for collection of blood sample 36415
This procedure involves inserting a small needle into a vein, typically in your arm, to collect a blood sample. It's a quick and simple process to help diagnose or monitor health conditions. You may feel a small prick, but discomfort is minimal.
146 services79 patients
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
127 services114 patients
Established patient office or other outpatient visit with straightforward medical decision making, if using time, 10 minutes or more 99212
This is a routine check-up for patients who have previously seen the doctor. During this 10-19 minute visit, the doctor will review your health status, discuss any concerns, and manage ongoing treatments or medications. It's a chance to ensure your health is on track.
86 services40 patients
New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203
This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.
49 services49 patients

Hospital Affiliations CMS Care Compare 5

Hospitals where this provider delivers care, identified from recent Medicare claims and place-of-service records.

Mercy Health - Tiffin Hospital

Acute Care Hospitals · Tiffin, OH
5/5 CMS rating
OwnershipVoluntary non-profit - Church
CMS Certification Number360089
Location45 St Lawrence DriveTiffin, OH 44883 · Seneca County
Emergency services Birthing friendly

Blanchard Valley Hospital

Acute Care Hospitals · Findlay, OH
4/5 CMS rating
OwnershipVoluntary non-profit - Other
CMS Certification Number360095
Location1900 South Main StreetFindlay, OH 45840 · Hancock County
Birthing friendly

Fostoria Community Hospital

Critical Access Hospitals · Fostoria, OH
OwnershipVoluntary non-profit - Private
CMS Certification Number361318
Location501 Van Buren StreetFostoria, OH 44830 · Seneca County

Bluffton Hospital

Critical Access Hospitals · Bluffton, OH
OwnershipVoluntary non-profit - Private
CMS Certification Number361322
Location139 Garau StreetBluffton, OH 45817 · Allen County
Emergency services

Wyandot Memorial Hospital

Critical Access Hospitals · Upper Sandusky, OH
OwnershipGovernment - Hospital District or Authority
CMS Certification Number361329
Location885 North Sandusky AvenueUpper Sandusky, OH 43351 · Wyandot County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 45840 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
$126.12 typical visit price
range $54.34 – $166.65
Typical copayment $31.53 (range $13.58 – $41.66)
Most-billed visit code 99204
Established Patient
$96.44 typical visit price
range $17.10 – $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.

67.77/100
MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program
Scored as part of a group practice
Quality46.71
Promoting Interoperability85
Improvement Activities40
Cost58.37

Other Providers at the Same Location NPPES 2

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

ALICIA NOEL SALLOT APRN-C
Nurse Practitioner (Primary Care)
1818 CHAPEL DR STE C
FINDLAY, OH 45840
Hancock County (425) 564-6419
ANDREA MAE GALLAGHER FNP
Nurse Practitioner (Family)
1818 CHAPEL DR STE C
FINDLAY, OH 45840
Hancock County (419) 429-7637

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 Nathaniel Ratnasamy's NPI number?

The NPI number for Nathaniel Ratnasamy is 1558363317. It was assigned to this individual provider in the NPPES registry on August 11, 2005.

Where is Nathaniel Ratnasamy located?

Nathaniel Ratnasamy practices at 1818 Chapel Dr Ste C, Findlay, OH 45840. The listed phone number is (419) 429-7637.

What is Nathaniel Ratnasamy's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Infectious Disease, with taxonomy code 207RI0200X.

Is Nathaniel Ratnasamy enrolled in Medicare?

Yes. Nathaniel Ratnasamy is registered in the Medicare PECOS system and accepts Medicare assignment, which means accepting the Medicare-approved amount as payment in full for covered services.

Which organization bills Medicare for Nathaniel Ratnasamy's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Nathaniel Ratnasamy reassigns Medicare benefits to Specialty Physicians Of Blanchard Valley LLC (Findlay, OH). 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 Nathaniel Ratnasamy's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

What insurance does Nathaniel Ratnasamy accept?

Health plans from Ambetter Health, Ambetter from Buckeye Health Plan, Ambetter from Meridian, Anthem Blue Cross and Blue Shield and MedMutual list Nathaniel Ratnasamy 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.

Is Nathaniel Ratnasamy affiliated with any hospitals?

According to CMS data, Nathaniel Ratnasamy is affiliated with Mercy Health - Tiffin Hospital, Blanchard Valley Hospital, Fostoria Community Hospital, Bluffton Hospital and Wyandot Memorial Hospital.

When was this NPI record last updated?

The NPPES record for Nathaniel Ratnasamy was last updated on July 11, 2018. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 8 years 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.