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Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

DR. HOWARD DOUGLAS KLEIN M.D.
NPI 1063456325
Internal Medicine in Northampton, MA

Active since June 16, 2006PECOS Enrolled
421 N MAIN ST, NORTHAMPTON, MA 01060(413) 584-4040 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 16, 2026.

About Dr. Howard Douglas Klein M.d. NPPES

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

DR. HOWARD DOUGLAS KLEIN M.D. (NPI 1063456325) is an individual internal medicine provider in Northampton, Massachusetts, licensed in Connecticut (027988) and active in the NPI registry since June 2006. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1063456325
Entity TypeIndividualMale
Primary Taxonomy207R00000X
Provider Legal NameDR. HOWARD DOUGLAS KLEINCredential: M.D.
Location Address421 N MAIN STNorthampton, MA 01060-5302
Mailing Address421 N Main StNorthampton, MA 01060-5302 · (413) 584-4040
Phone(413) 584-4040
Sole ProprietorNo
Enumeration DateJune 16, 2006
Last NPPES UpdateJuly 13, 2026
✔ NPI 1063456325 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207R00000X
License✔ Licensed in CT · 027988
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.
421 N MAIN ST, Northampton, MA 01060
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Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Howard Douglas Klein 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.

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 01060 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
$134.47 typical visit price
range $58.86 – $177.36
Typical copayment $33.61 (range $14.71 – $44.34)
Most-billed visit code 99204
Established Patient
$103.48 typical visit price
range $19.11 – $144.84
Typical copayment $25.87 (range $4.77 – $36.21)
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.

Other Providers at the Same Location NPPES 3

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

CORRINA RILEY
Registered Nurse (Psychiatric/Mental Health)
421 N MAIN ST
NORTHAMPTON, MA 01060
Hampshire County (413) 584-4040
MR. DANIEL L SCHWARTZ P.A.
Physician Assistant
421 N MAIN ST
NORTHAMPTON, MA 01060
Hampshire County (413) 584-4040
MARY MCDERMOTT M.S.W.
Social Worker (Clinical)
421 N MAIN ST
NORTHAMPTON, MA 01060
Hampshire County (413) 584-4040

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 Howard Klein's NPI number?

The NPI number for Howard Klein is 1063456325. It was assigned to this individual provider in the NPPES registry on June 16, 2006.

Where is Howard Klein located?

Howard Klein practices at 421 N Main St, Northampton, MA 01060. The listed phone number is (413) 584-4040.

What is Howard Klein's specialty?

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

Is Howard Klein enrolled in Medicare?

Yes. Howard Klein is registered in the Medicare PECOS enrollment system.

When was this NPI record last updated?

The NPPES record for Howard Klein was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 36 days 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.