Type 1 · Individual ✓ Active NPI ✓ Valid NPI checksum

Henry L Sonneborn, MD

Hematology & Oncology Physician in Dover, NH · enumerated 2006.

Data current as of Jul 13, 2026 · sourced from CMS NPPES

National Provider Identifier

1376508812

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Registry record

Entity type Individual (Type 1)

Name Henry L Sonneborn

Credential MD

Sex Male

Practice address 789 Central Ave, Dover, NH, 03820

Phone (603) 742-8787

Fax (603) 740-2446

Enumeration date Apr 18, 2006

Last updated in NPPES Feb 25, 2014

Taxonomy & licenses

207RH0003X Hematology & Oncology Physician Allopathic & Osteopathic Physicians · License 6086 (NH) Primary

MD · Doctor of Medicine: A physician who completed medical school (allopathic medicine), residency training, and state licensure. About the MD credential

Other identifiers

Identifier	Type	State	Issuer
1376508812	Medicaid	ME	-
3076000	Medicaid	NH	-

What is an NPI number?

A National Provider Identifier (NPI) is a unique 10-digit number that CMS assigns to every U.S. healthcare provider and organization under HIPAA. Type 1 NPIs identify individual providers; Type 2 NPIs identify organizations. The NPI appears on insurance claims, prescriptions, and credentialing paperwork, and never changes, even if the provider moves or changes specialty.

Read the full guide → Validate an NPI →

Frequently asked questions

What specialty is Henry Sonneborn?

Henry Sonneborn is registered in NPPES with the primary taxonomy of Hematology & Oncology Physician. The taxonomy code describes the provider's classification and area of specialization for claims and credentialing.

Is this the official NPI registry?

No. NPI Portal is a private site built on public CMS NPPES data. The official registry is npiregistry.cms.hhs.gov, operated by CMS.

Other providers at this practice address

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David Coppola Surgery Physician · Dover, NH NPI 1770583452 Erwin Kurt Cullamar Hospitalist Physician · Dover, NH NPI 1982605200 Jonathan Harris Certified Registered Nurse Anesthetist · Dover, NH NPI 1821090754 Magdalena Scherer Hospitalist Physician · Dover, NH NPI 1063414894 Polius Raslavicius Anatomic Pathology & Clinical Pathology Physician · Dover, NH NPI 1619960333 Sarah Macduffie Hospice and Palliative Medicine (Family Medicine) Physician · Dover, NH NPI 1689668352 Cheryl Moore Anatomic Pathology & Clinical Pathology Physician · Dover, NH NPI 1356332670 Glenn Littell Anatomic Pathology & Clinical Pathology Physician · Dover, NH NPI 1457332512

Source: CMS NPPES (public data). Snapshot 2026-07-13. Provider record last updated 2014-02-25.