JOHNS HOPKINS UNIVERSITY
NPI 1447221726
Clinical Medical Laboratory in Baltimore, MD

Q: What is Johns Hopkins University's NPI number?

The NPI number for Johns Hopkins University is 1447221726. It was assigned to this organization in the NPPES registry on January 27, 2006. The provider is doing business as Jhu - Reference Laboratory.

Q: What is Johns Hopkins University's specialty?

The primary specialty registered for this NPI is Clinical Medical Laboratory with taxonomy code 291U00000X.

Active since January 27, 2006

600 N WOLFE ST, CARNEGIE 417, BALTIMORE, MD 21287(410) 933-1328 Get Directions Write a Review

NPPES record last updated: July 22, 2025. Verified against the NPPES registry weekly; last sync: November 08, 2026.

Record update history: Jul 21, 2022, Mar 8, 2021 (2 updates tracked since 2021).

On this page

About Johns Hopkins University NPPES

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

JOHNS HOPKINS UNIVERSITY (NPI 1447221726), doing business as Jhu - Reference Laboratory, is a healthcare organization registered as a clinical medical laboratory in Baltimore, Maryland and active in the NPI registry since January 2006. The organization lists Nick Giarrantano, Prov, as its authorized official.

NPPES Registry Identity

NPI1447221726

Entity TypeOrganization

Primary Taxonomy291U00000X

Legal Business NameJOHNS HOPKINS UNIVERSITY

Location Address600 N WOLFE ST, CARNEGIE 417Baltimore, MD 21287-0005

Mailing AddressPo Box 64478Baltimore, MD 21264-4478 · (410) 933-1328

Phone(410) 933-1328

Organization SubpartYes

Authorized OfficialNick GiarrantanoProv · (410) 933-0000

Enumeration DateJanuary 27, 2006

Last NPPES UpdateJuly 22, 20252 updates tracked since enumeration

NPPES CertifiedJuly 10, 2025

✔ NPI 1447221726 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyClinical Medical LaboratoryLaboratories

Taxonomy Code291U00000X

Definition

(1) A clinical laboratory is a facility for the biological, microbiological, serological, chemical, immunohematological, hematological, biophysical, cytological, pathological, or other examination of materials derived from the human body for the purpose of providing information for the diagnosis, prevention, or treatment of any disease or impairment of, human beings. These examinations also include procedures to determine, measure, or otherwise describe the presence or absence of various substances or organisms in the body. Facilities only collecting or preparing specimens (or both) or only serving as a mailing service and not performing testing are not considered clinical laboratories. (2) Any facility that examines materials from the human body for purposes of providing information for the diagnosis, prevention, or treatment of any disease or impairment of, or the assessment of, the health of human beings. Typical divisions of a clinical laboratory include hematology, cytology, bacteriology, histology, biochemistry, medical toxicology, and serology.

600 N WOLFE ST, Baltimore, MD 21287

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Other Names 1

Doing Business AsJhu - Reference Laboratory

Other Identifiers 4

OtherW446JOMD · Blue Cross/blue Shield

Medicaid171218700MD

Other690009457MD · Rrmc

OtherM8950001MD · Carfirst Blue Shield

Medicare Participation & PECOS CMS

Medicare enrollment, revalidation and the clinicians who bill Medicare through this organization, from CMS.

Medicare Enrollment Status

✔

Enrolled in Medicare (PECOS)

Johns Hopkins University is registered in the CMS Provider Enrollment, Chain and Ownership System (PECOS).

Medicare Revalidation Due Date 2

Next revalidation due by December 31, 2026

This provider holds 2 Medicare enrollments with upcoming revalidation dates. Medicare-enrolled providers and suppliers confirm their enrollment information with CMS on a set cycle, every 5 years for most and every 3 years for medical equipment suppliers. CMS sets the due date for each enrollment.

StateEnrollment IDDue date

StateMarylandEnrollment IDO20040102000156Non-DME Part B · Independent Clinical LaboratoryDue dateDecember 31, 2026

StateMarylandEnrollment IDO20031215000719Non-DME Part B · Clinic/Group PracticeDue dateJanuary 31, 2027

Source: CMS Revalidation Due Date List, October 2026 release.

Clinicians Billing Medicare Through This Organization

4,467

Medicare enrollment records show 4,467 clinicians reassign Medicare billing to Johns Hopkins University, which bills Medicare for the services they deliver. Of these, 492 practice at this address and 3,151 within 10 miles. Listed here are the 20 practicing nearest to this location.

Clinicians by Medicare Specialty 74

Nurse Practitioner534

Anesthesiology309

Certified Registered Nurse Anesthetist (CRNA)299

Pediatric Medicine295

Internal Medicine289

Diagnostic Radiology247

Emergency Medicine169

Psychiatry148

66 other specialties2,177

Nearest to this location (20)

See all 4,467

Kedeja Adams, MD

Obstetrics/Gynecology

NPI 1972189645

600 N WOLFE ST
Baltimore, MD 21287

(410) 955-5000

✔ PECOSSame address

Samuel Adeyemo, MD

Psychiatry

NPI 1326693722

600 N WOLFE ST
Baltimore, MD 21287

(410) 933-4380

✔ PECOSSame address

Akosua Agyepong, MD

Pediatric Medicine

NPI 1669882668

600 N WOLFE ST
Baltimore, MD 21287

(410) 955-5000

✔ PECOSSame address

Zeshan Ahmad, MD

Cardiovascular Disease (Cardiology)

NPI 1124439682

600 N WOLFE ST
Baltimore, MD 21287

(410) 955-3097

✔ PECOSSame address

Syed Ali, M.D.

Pathology

NPI 1346205044

600 N WOLFE ST
Baltimore, MD 21287

(410) 955-2660

✔ PECOSSame address

Danielle Amundsen, MD

Internal Medicine

NPI 1619514478

600 N WOLFE STREET THE JOHNS HOPKINS HOSPITAL
Baltimore, MD 21287

(410) 955-5000

✔ PECOSSame address

Gunjan Arora

Endocrinology

NPI 1467068650

600 N WOLFE ST
Baltimore, MD 21287

(410) 955-5000

✔ PECOS✔ Accepts MedicareSame address

Imani Asher, D.D.S

Oral Surgery

NPI 1801159637

600 N WOLFE ST
Baltimore, MD 21287

(410) 955-5000

✔ PECOSSame address

Robin Avery, M.D.

Infectious Disease

NPI 1740244318

600 N WOLFE ST
Baltimore, MD 21287

(410) 955-8470

✔ PECOSSame address

John Baer, M.D.

Ophthalmology

NPI 1013984848

600 N WOLFE ST
Baltimore, MD 21287

(410) 955-5000

✔ PECOSSame address

Joshua Baer, CRNA

Certified Registered Nurse Anesthetist (CRNA)

NPI 1609242866

600 N WOLFE ST
Baltimore, MD 21287

(410) 955-5000

✔ Accepts MedicareSame address

Mohamad Bawadkji, MD

Medical Oncology

NPI 1457989360

600 N WOLFE ST
Baltimore, MD 21287

(410) 933-4380

✔ PECOSSame address

Meghan Bernier, MD

Critical Care (Intensivists)

NPI 1679899058

600 N WOLFE ST CMSC 2-124
Baltimore, MD 21287

(410) 955-2727

✔ PECOSSame address

Pavan Bhargava, MD

Neurology

NPI 1326270174

600 N WOLFE STREET PATHOLOGY 627
Baltimore, MD 21287

(410) 614-1522

✔ PECOSSame address

Sadia Bhatti, OD

Optometry

NPI 1215421482

600 N WOLFE ST
Baltimore, MD 21287

(410) 955-8893

✔ PECOSSame address

Zaid Bilgrami, MD

Diagnostic Radiology

NPI 1174197644

600 N WOLFE ST
Baltimore, MD 21287

(410) 955-5000

✔ PECOSSame address

Laura Blanchfield, C.R.N.P.

Nurse Practitioner

NPI 1861526766

600 N WOLFE ST MEYER 7-109
Baltimore, MD 21287

(443) 287-4932

✔ PECOSSame address

Andrew Cameron, M.D.

General Surgery

NPI 1952354383

600 N WOLFE ST
Baltimore, MD 21287

(410) 955-5464

✔ PECOSSame address

Juan Carhuapoma, M.D.

Anesthesiology

NPI 1639137664

600 N WOLFE ST
Baltimore, MD 21287

(410) 955-9441

✔ PECOSSame address

Lisa Christopher, M.D.

Rheumatology

NPI 1811949704

600 N WOLFE ST
Baltimore, MD 21287

(410) 955-3052

✔ PECOSSame address

See all 4,467 clinicians

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 32

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.

Pathology examination of tissue using a microscope, intermediate complexity 88305

A pathology examination of tissue with intermediate complexity involves studying a small sample of your body tissue under a microscope. This helps in identifying any abnormal cells or signs of disease. It's a detailed process requiring expert analysis to ensure accurate results.

5,503 services2,495 patients

Surgical pathology consultation and report on referred slides prepared elsewhere 88321

A surgical pathology consultation involves reviewing slides prepared at a different lab to confirm or clarify a diagnosis. It's a second opinion to ensure accuracy. A report with findings and interpretations is then provided for your doctor's reference.

3,586 services3,454 patients

Special stained specimen slides to examine tissue, each additional procedure 88341

Special stained specimen slides are used to analyze tissue in detail. In this process, extra procedures may be needed for a more thorough examination. These involve applying special stains to the tissue on slides, enhancing specific elements for closer study.

2,936 services747 patients

Special stained specimen slides to examine tissue, initial procedure 88342

This procedure involves the use of specially stained slides to examine tissue samples. The initial process involves obtaining a small tissue sample from your body. This sample is then placed on a slide and stained with special dyes to highlight different structures and elements. The stained slide is then examined under a microscope to help diagnose any potential health issues.

1,374 services1,168 patients

Cell examination of specimen, selective cellular enhancement technique 88112

Cell examination of a specimen using selective cellular enhancement technique is a lab process that improves the visibility of certain cells in a sample. It helps in identifying abnormalities or diseases. The process is non-invasive, safe, and aids in accurate diagnosis.

1,365 services899 patients

Microscopic genetic analysis of tumor, manual 88360

Microscopic genetic analysis of a tumor involves examining your tumor's genes under a microscope. This helps identify specific genetic changes in the tumor cells. This information can aid in diagnosing, predicting disease progression, and determining the most effective treatment options.

1,109 services429 patients

Flow cytometry technique for dna or cell analysis, each additional marker 88185

Flow cytometry is a technique that helps analyze the physical and chemical characteristics of cells or particles. When an additional marker is used, it aids in identifying specific cell types or stages of disease. This helps in precise diagnosis and treatment planning.

735 services47 patients

Surgical pathology consultation and report on referred material requiring preparation of slides 88323

A surgical pathology consultation involves the examination of tissue removed during surgery. The tissue is processed and slides are prepared for detailed study under a microscope. The findings are then compiled into a report to help guide your treatment plan.

628 services615 patients

Protein measurement, serum 84165

A serum protein measurement is a blood test that determines the levels of proteins in your blood. It is used to evaluate your overall health, and diagnose nutritional problems, kidney disease, liver disease, or immune disorders.

602 services584 patients

Pathology examination of tissue using a microscope, moderately high complexity 88307

A pathology examination of tissue with moderate complexity involves a detailed study of a small tissue sample from your body. Using a microscope, experts analyze the tissue's structure and cells to identify any abnormalities. This helps in diagnosing various health conditions accurately.

591 services195 patients

Immunologic analysis technique on serum (immunofixation) 86334

Immunofixation is a lab test that helps identify proteins called immunoglobulins in your blood serum. These proteins are part of your immune system. Changes in their levels can indicate certain diseases. The test is simple and only requires a blood sample.

580 services489 patients

Surgical pathology, gross and microscopic examinations, for prostate needle biopsy, any method G0416

This procedure involves taking a small tissue sample from your gland located beneath your bladder. The sample is then examined under a microscope by a pathologist to check for any abnormalities or diseases. This is a standard method to ensure your well-being.

461 services448 patients

Special stained specimen slides to examine tissue, each multiplex procedure 88344

Special stained specimen slides are used to study tissue in detail. This multiplex procedure involves applying different dyes to the tissue sample on a slide to highlight specific elements. These colors help identify any abnormalities in the tissue, aiding in accurate diagnosis and treatment planning.

387 services244 patients

Pap test, manual screening 88142

A Pap test is a routine procedure that checks for unusual changes in cells. During the manual screening, a small sample of cells is gently collected from the lower region of the body. These cells are then examined under a microscope to ensure your health.

378 services374 patients

Protein measurement, body fluid 84166

A protein measurement of body fluid is a test that gauges the amount of proteins in your fluids. This analysis helps in detecting various health conditions. It's done via a simple sample collection process, usually from blood or urine, in a safe and painless manner.

295 services281 patients

Pathology examination of tissue using a microscope, moderately low complexity 88304

A pathology examination of tissue, moderately low complexity, involves studying a small sample of your body tissue under a microscope. It helps to identify any abnormal cells or diseases. It's a routine procedure, not complex, and provides crucial insights for your diagnosis.

245 services214 patients

Genetic sequencing localization, initial procedure 88365

Genetic sequencing localization is a process to identify where specific genes are located in your DNA. During the initial procedure, a sample of your cells is collected, usually through a simple swab or blood test. This data is then analyzed to pinpoint the location of certain genes. This can help understand your genetic makeup and potential health risks.

176 services160 patients

Immunologic analysis technique on body fluid, other fluids with concentration 86335

Immunologic analysis is a diagnostic method that assesses your body fluids to detect health issues. It involves concentrating these fluids to enhance detection of specific proteins or cells. It helps identify immune system responses, aiding in accurate diagnosis and treatment.

161 services147 patients

Dna testing for genetic defects 88271

DNA testing for genetic defects involves examining your DNA, the unique molecules that carry instructions for your body's functioning. The test identifies changes in chromosomes, genes, or proteins that could lead to a genetic disorder. It's a preventative measure to manage potential health risks.

159 services25 patients

Special stained specimen slides to examine tissue including interpretation and report 88313

Special stained specimen slides are used to examine tissue samples. This involves applying special dyes to the tissue, which helps to highlight certain features under a microscope. The findings are then interpreted and a report is provided. This can aid in diagnosing various health conditions.

156 services125 patients

Genomic sequence analysis panel of dna or combined dna and rna of 51 or more genes associated with blood and lymphatic system disorders 81455

A genetic test for cancer is a medical test that checks your DNA for changes or mutations that might put you at risk for cancer. It's a proactive step to understand your health better and possibly take preventive measures if needed.

125 services125 patients

Special stained specimen slides to identify organisms including interpretation and report 88312

This service involves coloring specimen slides in a special way to help identify organisms. The colors make different parts of the organism stand out. Afterward, a detailed interpretation and report on the findings are provided.

77 services43 patients

Microscopic genetic analysis of tissue, manual, each additional multiplex stain procedure 88377

Microscopic genetic analysis of tissue is a detailed lab process that examines your cells' genetic material. If more than one stain procedure is needed, it's termed an 'additional multiplex stain procedure'. This helps to highlight different components within your cells, aiding in accurate diagnosis and treatment planning.

64 services63 patients

Chromosome analysis for genetic defects, analyze 100-300 cells 88275

Chromosome analysis is a test done on cells to identify any genetic defects. By studying 100-300 cells, it gives a comprehensive view of your genetic makeup. This helps in understanding any potential health risks you may carry.

56 services24 patients

Flow cytometry technique for dna or cell analysis, first marker 88184

Flow cytometry is a technique used to examine microscopic particles, like cells or DNA. It employs a beam of light to detect and measure physical and chemical characteristics of these particles. The 'first marker' refers to a specific characteristic or feature used to identify a particular cell or particle.

49 services48 patients

Flow cytometry technique for dna or cell analysis, 16 or more markers 88189

Flow cytometry is a method used to measure and analyze cells. It uses a beam of light to detect up to 16 or more markers on cells, helping to identify their type, function, or abnormalities. This technique aids in diagnosing various health conditions.

43 services42 patients

Flow cytometry technique for dna or cell analysis 88182

Flow cytometry is a technique used to measure physical and chemical characteristics of cells or particles. It's like a microscopic traffic camera, capturing each cell's size, shape, and structure. This information helps in understanding cell health and function, aiding in disease diagnosis and treatment.

39 services38 patients

Pap test 88141

A Pap test is a routine exam that checks for changes in cells that could signal a health concern. During this test, a small sample of cells is gently collected from the lower region of the body. The sample is then examined under a microscope to ensure everything looks normal.

37 services34 patients

Surgical pathology consultation and report, comprehensive 88325

A comprehensive surgical pathology consultation and report involves the detailed examination of tissue removed during surgery. This process aids in diagnosing diseases, assessing the extent of illness, and planning appropriate treatments. The findings are then compiled into a report for your doctor.

35 services35 patients

Evaluation of fine needle aspirate with interpretation and report 88173

This procedure involves using a thin needle to collect a small sample from an abnormal area or lump. The sample is then examined under a microscope to identify any potential issues. A report of the findings is provided for further analysis.

28 services25 patients

Genetic sequencing localization, each additional procedure 88364

Genetic sequencing localization is a process where specific regions of your DNA are identified and studied. If you're having additional procedures, it simply means that more areas of your DNA are being examined. This helps to understand your genetic makeup better and can assist in identifying potential health risks.

16 services15 patients

Genomic sequence analysis panel of dna or combined dna and rna of 5-50 genes associated with solid organ abnormal growth of tissue 81445

This test identifies specific genes linked with body organ cancer. It's a simple process where a sample of your blood or saliva is collected. The sample is then analyzed in a lab to find any genetic changes that might increase cancer risk. It's a proactive step to manage your health.

13 services13 patients

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 Johns Hopkins University's NPI number?

The NPI number for Johns Hopkins University is 1447221726. It was assigned to this organization in the NPPES registry on January 27, 2006. The provider is doing business as Jhu - Reference Laboratory.

Where is Johns Hopkins University located?

Johns Hopkins University is located at 600 N Wolfe St Carnegie 417, Baltimore, MD 21287. The listed phone number is (410) 933-1328.

What is Johns Hopkins University's specialty?

The primary specialty registered for this NPI is Clinical Medical Laboratory with taxonomy code 291U00000X.

Is Johns Hopkins University enrolled in Medicare?

Yes. Johns Hopkins University is registered in the Medicare PECOS enrollment system.

When is Johns Hopkins University's Medicare revalidation due?

According to the CMS Revalidation Due Date List (October 2026 release), Johns Hopkins University holds 2 Medicare enrollments with upcoming revalidation dates. The next is due by December 31, 2026 (Non-DME Part B, Maryland, Independent Clinical Laboratory). Medicare providers and suppliers revalidate their enrollment every 5 years, and medical equipment suppliers every 3 years. Confirm current requirements with your Medicare Administrative Contractor.

How many clinicians bill Medicare through Johns Hopkins University?

According to the CMS Revalidation Reassignment List (October 2026 release), 4,467 clinicians in 74 Medicare specialties reassign their Medicare billing to Johns Hopkins University. A 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 the clinician's services. The largest specialties are Nurse Practitioner (534), Anesthesiology (309) and Certified Registered Nurse Anesthetist (CRNA) (299). Of these, 492 practice at this address and 3,151 within 10 miles. Reassignment records can lag staffing changes; confirm a current affiliation with the organization.

When was this NPI record last updated?

The NPPES record for Johns Hopkins University was last updated on July 22, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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.