Provider records sourced from NPPES (CMS National Plan & Provider Enumeration System). Data current as of October 4, 2026.
NPIDirectory

Daniel Tseytlin, DO

Individual provider Internal Medicine Physician · NPI 1629413398

Daniel Tseytlin, DO practises Rheumatology in Nashua, New Hampshire. Graduated from Lake Erie College of Osteopathic Medicine, Erie in 2013, 13 years ago. Practices with St Joseph Hospital of Nashua Nh, a 268-clinician group, accepts Medicare assignment and offers telehealth. Licensed in New Hampshire and Pennsylvania.

Years since qualifying
13
Trained at
Lake Erie College of Osteopathic Medicine, Erie
Licensed in
NH, PA
In the registry since
2013
Specialties on file
4
What do these letters mean?
DO — Doctor of Osteopathic Medicine
A fully licensed physician, trained like an MD with additional musculoskeletal training. Equivalent practice rights in all 50 states.

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Practice location Address checks out

168 Kinsley St Ste 10
Nashua, NH 03060-3634
Phone: (603) 578-9363
Fax: (603) 578-9539
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Pin is approximate — placed at the ZIP-code centre, not the exact door.

Specialties & licences

Rheumatology Physician (primary) Taxonomy 207RR0500X · Licence 20427 (NH)
Internal Medicine Physician Taxonomy 207R00000X · Licence OT015100 (PA)
Internal Medicine Physician Taxonomy 207R00000X · Licence 20427 (NH)
Rheumatology Physician Taxonomy 207RR0500X · Licence OT015100 (PA)

Record details

NPI number1629413398
Entity typeIndividual (Type 1)
GenderMale
Credentials DO
Sole proprietorYes
NPI enumeratedMay 7, 2013
Last updated in NPPESJune 9, 2020
Certification dateJune 9, 2020

Medicare enrollment

From the CMS Doctors & Clinicians file — this clinician is enrolled in Medicare.

Medicare specialtyRHEUMATOLOGY
Also practisesINTERNAL MEDICINE
Medical schoolLAKE ERIE COLLEGE OF OSTEOPATHIC MEDICINE, ERIE
Graduated 2013 (13 years in practice)
Group practice St. Joseph Hospital Of Nashua Nh — 268 clinicians
Accepts Medicare assignment Yes — accepts the Medicare-approved amount
TelehealthOffers telehealth services

Medicare patients and services, 2024

From the CMS Medicare Physician & Other Practitioners file for calendar year 2024. It counts Original Medicare patients only, so a practice that mostly sees Medicare Advantage or privately insured patients looks smaller here than it is.

Medicare patients358
Services billed 695 a service is one billed item, such as a visit, a test or a procedure
Average patient age73

Dollar amounts are not shown. What Medicare pays a practice is gross billings, before staff, premises and tax and including the cost of any drugs it administers, so it is not what a clinician earns.

Practises at

Facilities the CMS Facility Affiliation file lists for this clinician.

Colleagues at St Joseph Hospital of Nashua Nh

Clinicians the CMS Doctors & Clinicians file lists under the same group practice. CMS counts 268 clinicians in the practice; 12 are shown here.

Other providers in Nashua