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DR. MARCOS SANTIAGO HERNANDEZ MD
NPI 1619080389
Specialist in San Juan, PR

Active since August 16, 2006PECOS EnrolledAccepts Medicare Assignment
ASHFORD MEDICAL CENTER, OFICINA 805 CALLE WASHINGTON, SAN JUAN, PR 00907(787) 600-6411 Get Directions Write a Review

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

About Dr. Marcos Santiago Hernandez Md NPPES

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

DR. MARCOS SANTIAGO HERNANDEZ MD (NPI 1619080389) is an individual specialist in San Juan, Puerto Rico, licensed in Puerto Rico (80006) and active in the NPI registry since August 2006. He is enrolled in Medicare PECOS, is affiliated with Presbyterian Community Hosp, and is a graduate of Other (1982).

NPPES Registry Identity

NPI1619080389
Entity TypeIndividualMale
Primary Taxonomy174400000X
Provider Legal NameDR. MARCOS SANTIAGO HERNANDEZCredential: MD
Location AddressASHFORD MEDICAL CENTER, OFICINA 805 CALLE WASHINGTONSan Juan, PR 00907-1524
Mailing AddressPo Box 8069San Juan, PR 00910-0069 · (787) 600-6411
Phone(787) 600-6411
Sole ProprietorYes
Medical School CMSOtherGraduated 1982
Enumeration DateAugust 16, 2006
Last NPPES UpdateJuly 1, 2026
NPPES CertifiedJuly 1, 2026
✔ NPI 1619080389 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtySpecialistOther Service Providers
Taxonomy Code174400000X
License✔ Licensed in PR · 80006
Definition
An individual educated and trained in an applied knowledge discipline used in the performance of work at a level requiring knowledge and skills beyond or apart from that provided by a general education or liberal arts degree.

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

Dr. Marcos Santiago Hernandez Md 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 ID42263543
PECOS Enrollment IDI20050224000546
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 Marcos Santiago Hernandez reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

San Juan Internal Medicine LLC
Specialist
29 CALLE WASHINGTON STE 309
San Juan, PR 00907
  • Reassigned Medicare billing, Puerto Rico enrollment
NPI 1295498889 (787) 396-6336

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 3

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.

Established patient office or other outpatient visit with low level od decision making, if using time, 20 minutes or more 99213
This is a routine visit for patients who have already been seen by the healthcare provider. During this approximately 20-29 minute appointment, your health status will be evaluated and any necessary treatments or tests will be discussed. It's a chance to address any health concerns you may have.
196 services66 patients
Telephone medical discussion with physician, 11-20 minutes 99442
This is a service where you have a phone conversation with your doctor for 11-20 minutes. It's used for discussing health concerns, reviewing test results, or managing ongoing conditions. It's a convenient way to receive medical advice without an in-person visit.
13 services13 patients
New patient office or other outpatient visit with low level of medical decision making, if using time, 30 minutes or more 99203
This service involves an initial office or outpatient visit for a new patient. The healthcare professional will spend 30-44 minutes understanding your health history, current issues, and discussing possible treatment plans. It's a comprehensive evaluation to start your healthcare journey.
12 services12 patients

Hospital Affiliations CMS Care Compare

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

Presbyterian Community Hosp

Acute Care Hospitals · San Juan, PR
OwnershipVoluntary non-profit - Private
CMS Certification Number400001
Location1451 Ashford AvenueSan Juan, PR 00907 · San Juan County
Emergency services

Referred Medical Equipment & Supplies CMS DME claims 2

Durable medical equipment, devices and supplies this provider ordered from DME suppliers for patients, from Medicare fee-for-service claims.

Blood glucose test or reagent strips for home blood glucose monitor, per 50 strips A4253
DME-Other DME · category DE017N
3 suppliers12 claims31 services$7.08 avg. paid by Medicare
Lancets, per box of 100 A4259
DME-Medical/Surgical Supplies · category DA000N
4 suppliers12 claims16 services$1.20 avg. paid by Medicare
Dollar amounts are the average Medicare paid the supplier per service. They are not the cost to the patient.

Other Providers at the Same Location NPPES 5

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

JOSUE RAMON MERCADO MD
Internal Medicine (Cardiovascular Disease)
ASHFORD MEDICAL CENTER, SUITE 309
SAN JUAN, PR 00907
San Juan Municipio (787) 724-3507
CLINICA PODIATRICA OPPENHEIMER
Podiatrist
ASHFORD MEDICAL CENTER, 29 WASHINGTON ST SUITE 702
SAN JUAN, PR 00907
San Juan Municipio (787) 399-4734
CENTER FOR ADVANCED SURGERY
Surgery
ASHFORD MEDICAL CENTER, WASHINGTON #29 SUITE 504
SAN JUAN, PR 00907
San Juan Municipio (787) 724-0278
AFKT LLC
Orthopaedic Surgery
ASHFORD MEDICAL CENTER, CALLE WASHINGTON SUITE 303 #29
SAN JUAN, PR 00907
San Juan Municipio (787) 249-3799
RAUL G FRANCESCHI MD
Ophthalmology
ASHFORD MEDICAL CENTER, SUITE 707
SAN JUAN, PR 00907
San Juan Municipio (787) 723-4670

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 Marcos Santiago Hernandez's NPI number?

The NPI number for Marcos Santiago Hernandez is 1619080389. It was assigned to this individual provider in the NPPES registry on August 16, 2006.

Where is Marcos Santiago Hernandez located?

Marcos Santiago Hernandez practices at Ashford Medical Center Oficina 805 Calle Washington, San Juan, PR 00907. The listed phone number is (787) 600-6411.

What is Marcos Santiago Hernandez's specialty?

The primary specialty registered for this NPI is Specialist with taxonomy code 174400000X.

Is Marcos Santiago Hernandez enrolled in Medicare?

Yes. Marcos Santiago Hernandez 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 Marcos Santiago Hernandez's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Marcos Santiago Hernandez reassigns Medicare benefits to San Juan Internal Medicine LLC (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 Marcos Santiago Hernandez's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Marcos Santiago Hernandez affiliated with any hospitals?

According to CMS data, Marcos Santiago Hernandez is affiliated with Presbyterian Community Hosp.

When was this NPI record last updated?

The NPPES record for Marcos Santiago Hernandez was last updated on July 1, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 3 months 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.