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UBALDO G SANTIAGO BUONO M.D.
NPI 1104825611
Internal Medicine - Geriatric Medicine in San Juan, PR

Active since July 18, 2005PECOS EnrolledAccepts Medicare Assignment
1304 WILSON STREET, COND EL VIGIA APT 8 S, SAN JUAN, PR 00907(787) 536-2033(787) 722-2374 Get Directions Write a Review

NPPES record last updated: June 10, 2024. Verified against the NPPES registry weekly; last sync: October 25, 2026.

Record update history: Jun 10, 2024, Jan 16, 2019, Sep 27, 2018 (3 updates tracked since 2018).

About Ubaldo G Santiago Buono M.d. NPPES

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

UBALDO G SANTIAGO BUONO M.D. (NPI 1104825611) is an individual geriatric medicine provider in San Juan, Puerto Rico, licensed in Puerto Rico (13571) and active in the NPI registry since July 2005. He is enrolled in Medicare PECOS, is affiliated with Doctor's Center De San Juan, and is a graduate of University Central Del Caribe Escuela De Medicina (1996).

NPPES Registry Identity

NPI1104825611
Entity TypeIndividualMale
Primary Taxonomy207RG0300X
Provider Legal NameUBALDO G SANTIAGO BUONOCredential: M.D.
Location Address1304 WILSON STREET, COND EL VIGIA APT 8 SSan Juan, PR 00907-2243
Mailing Address1304 Calle Wilson Apt 8sSan Juan, PR 00907-2243 · (787) 722-2371 · Fax (787) 722-2374
Phone(787) 536-2033
Fax(787) 722-2374
Sole ProprietorYes
Medical School CMSUniversity Central Del Caribe Escuela De MedicinaGraduated 1996
Enumeration DateJuly 18, 2005
Last NPPES UpdateJune 10, 20243 updates tracked since enumeration
NPPES CertifiedJune 10, 2024
✔ NPI 1104825611 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Geriatric MedicineAllopathic & Osteopathic Physicians
Taxonomy Code207RG0300X
License✔ Licensed in PR · 13571
Definition
An internist who has special knowledge of the aging process and special skills in the diagnostic, therapeutic, preventive and rehabilitative aspects of illness in the elderly. This specialist cares for geriatric patients in the patient's home, the office, long-term care settings such as nursing homes and the hospital.

Other Identifiers 2

Other0020882PR · Medicare Ptan
Other7000006137PR · Remitance No

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

Ubaldo G Santiago Buono 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 ID2961413620
PECOS Enrollment IDI20060509000436
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 Ubaldo Santiago Buono reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

San Francisco Health System Inc
General Acute Care Hospital
371 DE DIEGO AVE
San Juan, PR 00923
  • Reassigned Medicare billing, Puerto Rico enrollment
  • 5 clinicians in this Medicare group
NPI 1598798811 (787) 767-5100

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 2

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.
144 services16 patients
Initial hospital care with straightforward or low level of medical decision making, per day, if using time, at least 40 minutes 99221
Initial hospital inpatient care refers to the first day of your stay in the hospital. This service typically includes a 30-minute check-up with a healthcare professional. They'll assess your health, discuss your condition, and plan your treatment. It's part of ensuring you receive the best possible care.
16 services16 patients

Hospital Affiliations CMS Care Compare 2

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

Doctor's Center De San Juan

Acute Care Hospitals · San Juan, PR
OwnershipProprietary
CMS Certification Number400006
Location1395 Calle San Rafael Parada 20San Juan, PR 00909 · San Juan County
Emergency services

Caribbean Medical Center

Acute Care Hospitals · Fajardo, PR
OwnershipProprietary
CMS Certification Number400131
Location151 Ave Osvaldo MolinaFajardo, PR 00738 · Fajardo County
Emergency services

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 00907 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
$172.44 typical visit price
range $56.86 – $172.44
Typical copayment $43.11 (range $14.21 – $43.11)
Most-billed visit code 99205
Established Patient
$100.24 typical visit price
range $18.24 – $140.44
Typical copayment $25.06 (range $4.56 – $35.11)
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.

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 Ubaldo Santiago Buono's NPI number?

The NPI number for Ubaldo Santiago Buono is 1104825611. It was assigned to this individual provider in the NPPES registry on July 18, 2005.

Where is Ubaldo Santiago Buono located?

Ubaldo Santiago Buono practices at 1304 Wilson Street Cond El Vigia Apt 8 S, San Juan, PR 00907. The listed phone number is (787) 536-2033.

What is Ubaldo Santiago Buono's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Geriatric Medicine, with taxonomy code 207RG0300X.

Is Ubaldo Santiago Buono enrolled in Medicare?

Yes. Ubaldo Santiago Buono 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 Ubaldo Santiago Buono's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Ubaldo Santiago Buono reassigns Medicare benefits to San Francisco Health System Inc (San Juan, PR). 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 Ubaldo Santiago Buono's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Ubaldo Santiago Buono affiliated with any hospitals?

According to CMS data, Ubaldo Santiago Buono is affiliated with Doctor's Center De San Juan and Caribbean Medical Center.

When was this NPI record last updated?

The NPPES record for Ubaldo Santiago Buono was last updated on June 10, 2024. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 2 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.