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DR. RYAN WILLIAM NELSON M.D./PH.D.
NPI 1649634221
Pediatrics - Pediatric Allergy/Immunology in Boston, MA

Active since April 08, 2016PECOS Enrolled
300 LONGWOOD AVE BOSTON CHILDREN'S HOSPITAL, HUNNEWELL BUILDING, PAVILION 129, HOUSESTAFF LOUNGE, BOSTON, MA 02115(612) 968-0708 Get Directions Write a Review

NPPES record last updated: June 1, 2022. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Dr. Ryan William Nelson M.d./ph.d. NPPES

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

DR. RYAN WILLIAM NELSON M.D./PH.D. (NPI 1649634221) is an individual pediatric allergy/immunology provider in Boston, Massachusetts, licensed in Massachusetts (279471) and active in the NPI registry since April 2016. He is enrolled in Medicare PECOS.

NPPES Registry Identity

NPI1649634221
Entity TypeIndividualMale
Primary Taxonomy2080P0201X
Provider Legal NameDR. RYAN WILLIAM NELSONCredential: M.D./PH.D.
Location Address300 LONGWOOD AVE BOSTON CHILDREN'S HOSPITAL, HUNNEWELL BUILDING, PAVILION 129, HOUSESTAFF LOUNGEBoston, MA 02115
Mailing Address300 Longwood Ave Boston Children's Hospital, Hunnewell Building, Pavilion 129, Housestaff LoungeBoston, MA 02115 · (612) 968-0708
Phone(612) 968-0708
Sole ProprietorNo
Enumeration DateApril 8, 2016
Last NPPES UpdateJune 1, 2022
NPPES CertifiedJune 1, 2022
✔ NPI 1649634221 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyPediatrics · Pediatric Allergy/ImmunologyAllopathic & Osteopathic Physicians
Taxonomy Code2080P0201X
License✔ Licensed in MA · 279471
Definition
A pediatrician who specializes in the diagnosis and treatment of allergies, allergic reactions, and immunologic diseases in children.
300 LONGWOOD AVE BOSTON CHILDREN'S HOSPITAL, Boston, MA 02115
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Medicare Participation & PECOS CMS

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

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Dr. Ryan William Nelson M.d./ph.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 Reassignments

4

Medicare enrollment records show Ryan Nelson reassigns Medicare billing to 4 organizations. Each organization bills Medicare for the services this provider delivers there; the nearest is listed first.

Fairview Express Care
1,104 mi
Pediatric Rehabilitation Medicine
9680 TAMARACK RD, SUITE 130
Woodbury, MN 55125
  • Reassigned Medicare billing, Minnesota enrollment
  • 3,633 clinicians in this Medicare group
NPI 1700235587 (612) 273-1172
Fairview Specialty Services
1,117 mi
Point of Service
1700 UNIVERSITY AVE W
Saint Paul, MN 55104
  • Reassigned Medicare billing, Minnesota enrollment
  • 2,373 clinicians in this Medicare group
NPI 1912066218 (763) 525-9919
University Of Minnesota Health Clinics And Surgery Center Inc
1,120 mi
Anesthesiology
909 FULTON ST SE
Minneapolis, MN 55455
  • Reassigned Medicare billing, Minnesota enrollment
  • 1,662 clinicians in this Medicare group
NPI 1003485004 (612) 273-8383
University Of Minnesota Physicians
1,120 mi
Multi-Specialty
720 WASHINGTON AVE SE STE 200
Minneapolis, MN 55414
  • Reassigned Medicare billing, Minnesota enrollment
  • 1,453 clinicians in this Medicare group
NPI 1477598118 (612) 672-7422

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

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.

MARYAM FAREED ASHOOR M.D.
Student in an Organized Health Care Education/Training Program
300 LONGWOOD AVE BOSTON CHILDREN'S HOSPITAL, FEGAN 6
BOSTON, MA 02115
Suffolk County (857) 381-2802
MRS. CAMILLE JUTRAS M.D.
Student in an Organized Health Care Education/Training Program
300 LONGWOOD AVE BOSTON CHILDREN'S HOSPITAL, BADER 634.
BOSTON, MA 02115
Suffolk County (617) 355-7327
ELENA NIKOLOVA MD
Student in an Organized Health Care Education/Training Program
300 LONGWOOD AVE BOSTON CHILDREN'S HOSPITAL, CB1110, HOUSESTAFF LOUNGE
BOSTON, MA 02115
Suffolk County (617) 355-6000

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 Ryan Nelson's NPI number?

The NPI number for Ryan Nelson is 1649634221. It was assigned to this individual provider in the NPPES registry on April 8, 2016.

Where is Ryan Nelson located?

Ryan Nelson practices at 300 Longwood Ave Boston Children's Hospital Hunnewell Building, Pavilion 129, Housestaff Lounge, Boston, MA 02115. The listed phone number is (612) 968-0708.

What is Ryan Nelson's specialty?

The primary specialty registered for this NPI is Pediatrics, specializing in Pediatric Allergy/Immunology, with taxonomy code 2080P0201X.

Is Ryan Nelson enrolled in Medicare?

Yes. Ryan Nelson is registered in the Medicare PECOS enrollment system.

Which organizations bill Medicare for Ryan Nelson's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Ryan Nelson reassigns Medicare benefits to 4 organizations: Fairview Express Care (Woodbury, MN), Fairview Specialty Services (Saint Paul, MN), University Of Minnesota Health Clinics And Surgery Center Inc (Minneapolis, MN) and University Of Minnesota Physicians (Minneapolis, MN). Each 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 Ryan Nelson's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

When was this NPI record last updated?

The NPPES record for Ryan Nelson was last updated on June 1, 2022. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 4 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.