DR. WARREN MORSE ALLEN M.D.
NPI 1801850722
Pathology - Cytopathology in Santa Monica, CA

Q: What is Warren Allen's NPI number?

The NPI number for Warren Allen is 1801850722. It was assigned to this individual provider in the NPPES registry on April 17, 2006.

Q: What is Warren Allen's specialty?

The primary specialty registered for this NPI is Pathology, specializing in Cytopathology, with taxonomy code 207ZC0500X.

Q: When was this NPI record last updated?

The NPPES record for Warren Allen was last updated on September 11, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.

Active since April 17, 2006PECOS EnrolledAccepts Medicare Assignment

90.52/100

CMS Quality Rating

1328 22ND ST, SANTA MONICA, CA 90404(310) 829-8101(310) 829-6509 Get Directions Write a Review

NPPES record last updated: September 11, 2025. Verified against the NPPES registry weekly; last sync: August 09, 2026.

On this page

About Dr. Warren Morse Allen M.d. NPPES

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

DR. WARREN MORSE ALLEN M.D. (NPI 1801850722) is an individual cytopathology provider in Santa Monica, California, licensed in California (G39548) and active in the NPI registry since April 2006. He is enrolled in Medicare PECOS and is a graduate of University Of California, Geffen School Of Medicine (1978).

NPPES Registry Identity

NPI1801850722

Entity TypeIndividualMale

Primary Taxonomy207ZC0500X

Provider Legal NameDR. WARREN MORSE ALLENCredential: M.D.

Location Address1328 22ND STSanta Monica, CA 90404-2032

Mailing Address1328 22nd StSanta Monica, CA 90404-2032

Phone(310) 829-8101

Fax(310) 829-6509

Sole ProprietorNo

Medical School CMSUniversity Of California, Geffen School Of MedicineGraduated 1978

Enumeration DateApril 17, 2006

Last NPPES UpdateSeptember 11, 2025

✔ NPI 1801850722 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses 2

★ Primary SpecialtyPathology · CytopathologyAllopathic & Osteopathic Physicians

Taxonomy Code207ZC0500X

License✔ Licensed in CA · G39548

Definition

A cytopathologist is an anatomic pathologist trained in the diagnosis of human disease by means of the study of cells obtained from body secretions and fluids, by scraping, washing, or sponging the surface of a lesion, or by the aspiration of a tumor mass or body organ with a fine needle. A major aspect of a cytopathologist's practice is the interpretation of Papanicolaou-stained smears of cells from the female reproductive systems, the Pap test. However, the cytopathologist's expertise is applied to the diagnosis of cells from all systems and areas of the body. He/she is a consultant to all medical specialists.

Also ListedPathology · Anatomic Pathology & Clinical PathologyTaxonomy 207ZP0102X · License G39548 (CA)

Medicare Participation & PECOS CMS

Medicare enrollment, assignment, and ordering and referring status from the CMS PECOS system.

Medicare Enrollment Status

✔

Enrolled in Medicare and accepts Medicare assignment

Dr. Warren Morse Allen 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 ID6002719796

PECOS Enrollment IDI20040129001034

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.

Areas of Expertise CMS Part B claims 22

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.

520 services280 patients

Pathology examination of tissue using a microscope, intermediate complexity 88305

272 services101 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.

183 services55 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.

174 services83 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.

97 services88 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.

95 services31 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.

93 services46 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.

91 services79 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.

78 services71 patients

Preparation of tissue for examination by removing any calcium present 88311

This procedure involves treating tissue samples to remove any calcium, which can interfere with the examination. The tissue is soaked in a special solution that safely dissolves the calcium, leaving the tissue intact for accurate analysis. This helps in making precise diagnoses.

74 services74 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.

73 services72 patients

Examination of archival tissue for genetic analysis 88363

Examination of archival tissue for genetic analysis involves studying previously collected tissue samples. This process helps detect any genetic alterations that may be linked to certain diseases. It's a crucial step in understanding your health and planning appropriate treatments.

56 services52 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.

40 services26 patients

Pathology examination of tissue using a microscope, limited examination 88300

A pathology examination of tissue using a microscope is a procedure where a small sample of your tissue is observed under a microscope. This limited examination helps identify any abnormal cells or signs of disease, aiding in accurate diagnosis and treatment planning.

39 services37 patients

Pathology examination of specimen during surgery, first tissue block 88331

A pathology examination during surgery involves the immediate analysis of a removed tissue sample. This helps the surgeon make decisions during your operation. The "first tissue block" refers to the initial sample examined. It's a vital step to ensure your health.

39 services23 patients

Pathology examination of tissue using a microscope, high complexity 88309

A high complexity pathology examination involves studying body tissue under a microscope to identify any abnormalities. This intricate process helps in diagnosing various conditions and deciding on the best treatment plan.

32 services31 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.

27 services20 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.

24 services14 patients

Special stained specimen slides to examine tissue, initial procedure 88342

14 services14 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.

13 services13 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.

13 services11 patients

Evaluation of fine needle aspirate with interpretation and report 88173

11 services11 patients

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 90404 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

$142.39 typical visit price

range $62.96 – $187.60

Typical copayment $35.59 (range $15.74 – $46.90)

Most-billed visit code 99204

Established Patient

$109.96 typical visit price

range $20.84 – $153.61

Typical copayment $27.49 (range $5.21 – $38.40)

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.

Medicare Quality Performance CMS QPP · MIPS

Performance in the CMS Quality Payment Program: the MIPS final score across four weighted categories, and the individual quality measures reported to Medicare.

90.52/100

MIPS Final ScoreMerit-based Incentive Payment System · CMS Quality Payment Program

Scored as part of a group practice

Quality

81.05

Improvement Activities

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.

DONALD L MORTON MD & ASSOCIATES MEDICAL GROUP

Surgery (Surgical Oncology)

1328 22ND ST
SANTA MONICA, CA 90404

Los Angeles County (310) 829-8781

STUART M MILLER MD INC

Internal Medicine (Cardiovascular Disease)

1328 22ND ST
SANTA MONICA, CA 90404

Los Angeles County (310) 264-2561

YUKI TAKASUMI M.D.

Pathology (Anatomic Pathology & Clinical Pathology)

1328 22ND ST, DEPARTMENT OF PATHOLOGY
SANTA MONICA, CA 90404

Los Angeles County (310) 829-8101

DR. SOPHIE M. ANDRIASCHUK M.D.

Anesthesiology

1328 22ND ST
SANTA MONICA, CA 90404

Los Angeles County (310) 829-8202

DR. DAVID ASHER RAKOFF M.D.

Anesthesiology

1328 22ND ST
SANTA MONICA, CA 90404

Los Angeles County (310) 423-2056

MARK S. GOH M.D.

Anesthesiology

1328 22ND ST
SANTA MONICA, CA 90404

Los Angeles County (310) 829-8202

SOPHIE M. ANDRIASCHUK, M.D., INC.

Anesthesiology

1328 22ND ST
SANTA MONICA, CA 90404

Los Angeles County (310) 829-8202

DR. KEVIN M. MILLER M.D.

Anesthesiology

1328 22ND ST, ST. JOHN'S ANESTHESIA DEPARTMENT
SANTA MONICA, CA 90404

Los Angeles County (818) 712-0598

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 Warren Allen's NPI number?

The NPI number for Warren Allen is 1801850722. It was assigned to this individual provider in the NPPES registry on April 17, 2006.

Where is Warren Allen located?

Warren Allen practices at 1328 22nd St, Santa Monica, CA 90404. The listed phone number is (310) 829-8101.

What is Warren Allen's specialty?

The primary specialty registered for this NPI is Pathology, specializing in Cytopathology, with taxonomy code 207ZC0500X.

Is Warren Allen enrolled in Medicare?

Yes. Warren Allen 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.

When was this NPI record last updated?

The NPPES record for Warren Allen was last updated on September 11, 2025. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 11 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.