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: August 16, 2026.

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

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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

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

Other Providers at the Same Location NPPES 20

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

PAMELA KIMZEY DONOHUE SCD, PA-C

Physician Assistant (Medical)

600 N WOLFE ST, NELSON 2-133
BALTIMORE, MD 21287

Baltimore City (410) 955-5232

MR. CHRISTOPHER DAVID SCHRIEBER M.S., PA-C

Physician Assistant

600 N WOLFE ST, MARBURG B-186
BALTIMORE, MD 21287

Baltimore City (410) 955-8708

DR. SABRINA CHRISTINE SOPHA M.D.

Pathology (Anatomic Pathology & Clinical Pathology)

600 N WOLFE ST
BALTIMORE, MD 21287

Baltimore City (410) 955-3580

SANDRA KING D.H.

Dental Hygienist

600 N WOLFE ST, BLALOCK 266
BALTIMORE, MD 21287

Baltimore City (410) 955-6662

THERESA J RUDDY C.P.N.P., CRNP

Nurse Practitioner (Acute Care)

600 N WOLFE ST
BALTIMORE, MD 21287

Baltimore City (410) 955-5260

DR. SUMAN PAUL M.B.B.S, PHD

Internal Medicine (Medical Oncology)

600 N WOLFE ST
BALTIMORE, MD 21287

Baltimore City (410) 955-5000

MS. SARAH CATHERINE COLLICA

Psychiatry & Neurology (Psychiatry)

600 N WOLFE ST
BALTIMORE, MD 21287

Baltimore City (443) 287-4701

JEFF S EHRESMAN

Student in an Organized Health Care Education/Training Program

600 N WOLFE ST
BALTIMORE, MD 21287

Baltimore City (410) 955-5000

KAITLYN MARIE FRAZIER MD

Otolaryngology

600 N WOLFE ST, JOHNS HOPKINS HOSPITAL, DEPT OF OTOLARYNGOLOGY
BALTIMORE, MD 21287

Baltimore City (410) 955-5000

CAROLINE FRANCES PLOTT MS

Student in an Organized Health Care Education/Training Program

600 N WOLFE ST
BALTIMORE, MD 21287

Baltimore City (410) 955-3080

BRIAN TRAN PHARMD

Pharmacist (Ambulatory Care)

600 N WOLFE ST, CARNEGIE BLDG ROOM 180
BALTIMORE, MD 21287

Baltimore City (678) 879-3126

EMAD MUHAMMED ALI IBRAHIM

Student in an Organized Health Care Education/Training Program

600 N WOLFE ST
BALTIMORE, MD 21287

Baltimore City (410) 955-5000

AARON DOBBINS

Student in an Organized Health Care Education/Training Program

600 N WOLFE ST
BALTIMORE, MD 21287

Baltimore City (410) 955-9790

ETHAN THIO

Student in an Organized Health Care Education/Training Program

600 N WOLFE ST
BALTIMORE, MD 21287

Baltimore City (410) 955-5000

ALEXANDRA JADE DAVIS

Student in an Organized Health Care Education/Training Program

600 N WOLFE ST
BALTIMORE, MD 21287

Baltimore City (410) 955-5000

ARIE CALEB VAN WIEREN

Student in an Organized Health Care Education/Training Program

600 N WOLFE ST
BALTIMORE, MD 21287

Baltimore City (410) 955-5000

MS. ANA C ZEGHIBE

Student in an Organized Health Care Education/Training Program

600 N WOLFE ST
BALTIMORE, MD 21287

Baltimore City (410) 955-5000

MURPHY KENNY

Student in an Organized Health Care Education/Training Program

600 N WOLFE ST
BALTIMORE, MD 21287

Baltimore City (410) 955-5000

DR. PRADEEP Y RAMULU MD

Ophthalmology

600 N WOLFE ST
BALTIMORE, MD 21287

Baltimore City (410) 955-6052

LEISHA EMENS

Internal Medicine (Medical Oncology)

600 N WOLFE ST, SUITE 4628
BALTIMORE, MD 21287

Baltimore City (410) 955-8964

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.

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 13 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.