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DR. ANN BUTLER ZIMRIN M.D.
NPI 1215991179
Internal Medicine - Hematology & Oncology in Baltimore, MD

Active since April 16, 2006PECOS EnrolledAccepts Medicare Assignment
22 S GREENE ST, BALTIMORE, MD 21201(419) 328-2594(410) 328-6896 Get Directions Write a Review

NPPES record last updated: March 8, 2011. Verified against the NPPES registry weekly; last sync: October 18, 2026.

About Dr. Ann Butler Zimrin M.d. NPPES

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

DR. ANN BUTLER ZIMRIN M.D. (NPI 1215991179) is an individual hematology & oncology provider in Baltimore, Maryland, licensed in Maryland (D39639) and active in the NPI registry since April 2006. She is enrolled in Medicare PECOS, is affiliated with University Of Maryland Medical Center, and is a graduate of Other (1984).

NPPES Registry Identity

NPI1215991179
Entity TypeIndividualFemale
Primary Taxonomy207RH0003X
Provider Legal NameDR. ANN BUTLER ZIMRINCredential: M.D.
Location Address22 S GREENE STBaltimore, MD 21201-1544
Mailing AddressPo Box 62602Baltimore, MD 21264-2602 · (419) 328-2594 · Fax (410) 328-6896
Phone(419) 328-2594
Fax(410) 328-6896
Sole ProprietorNo
Medical School CMSOtherGraduated 1984
Enumeration DateApril 16, 2006
Last NPPES UpdateMarch 8, 2011
✔ NPI 1215991179 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Hematology & OncologyAllopathic & Osteopathic Physicians
Taxonomy Code207RH0003X
License✔ Licensed in MD · D39639
Definition
An internist doctor of osteopathy that specializes in the treatment of the combination of hematology and oncology disorders. A doctor of osteopathy that is board eligible/certified by the American Osteopathic Board of Internal Medicine WAS able to obtain a Certificate of Special Qualifications in the field of Hematology and Oncology. The Certificate is NO longer offered.
22 S GREENE ST, Baltimore, MD 21201
Open in Google Maps ↗

Other Identifiers 6

Other604401-02 & 03MD · Bc/bs
OtherS053-0042MD · Blue Choice-regional
Medicare UPINE67113MD
Medicaid442100100MD
Medicare PIN830008237MD
Medicare PIN349LE269MD

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. Ann Butler Zimrin 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 ID5092909283
PECOS Enrollment IDI20101102000156
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 Ann Zimrin reassigns Medicare billing to 1 organization. The organization bills Medicare for the services this provider delivers there.

University Of Maryland Oncology Associates, PA
Same address
Hematology & Oncology
22 S GREENE ST
Baltimore, MD 21201
  • Reassigned Medicare billing, Maryland enrollment
  • 89 clinicians in this Medicare group
NPI 1679523575 (410) 328-8040

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 6

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 50 minutes 99233
Follow-up hospital inpatient care per day typically involves a 35-minute check-up by your healthcare provider. This service includes monitoring your health progress, adjusting your treatment plan if needed, and answering any questions you may have about your condition or care.
87 services19 patients
Initial hospital care with moderate level of medical decision making, if using time, at least 75 minutes 99223
Initial hospital inpatient care per day, typically 70 minutes, refers to the daily medical service provided to patients admitted to the hospital. This includes a comprehensive evaluation, diagnosis, treatment plan, and monitoring of your health condition. It ensures your well-being during your hospital stay.
47 services39 patients
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.
27 services18 patients
Established patient office or other outpatient visit with moderate level of decision making, if using time, 30 minutes or more 99214
This is a routine check-up for patients who have previously visited our clinic. It involves a comprehensive review of your health and any ongoing treatments. The consultation lasts between 30-39 minutes, allowing enough time to discuss any concerns.
22 services20 patients
New patient office or other outpatient visit with moderate level of medical decision making, if using time, 45 minutes or more 99204
This is a first-time office or outpatient visit lasting between 45-59 minutes. The healthcare provider evaluates your health, discusses your medical history, and may suggest further tests or treatments. It's an opportunity to ask questions and understand your health better.
20 services20 patients
Initial hospital care with straightforward or low-level medical decision making, if using time, at least 55 minutes 99222
Initial hospital inpatient care is a service where a healthcare provider spends about 50 minutes per day overseeing your care while you're admitted in the hospital. This includes reviewing your health status, planning your treatment, and ensuring your safety and comfort.
12 services12 patients

Hospital Affiliations CMS Care Compare

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

University Of Maryland Medical Center

Acute Care Hospitals · Baltimore, MD
3/5 CMS rating
OwnershipVoluntary non-profit - Private
CMS Certification Number210002
Location22 South Greene StreetBaltimore, MD 21201 · Baltimore City County
Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 21201 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
$183.44 typical visit price
range $60.73 – $183.44
Typical copayment $45.86 (range $15.18 – $45.86)
Most-billed visit code 99205
Established Patient
$106.59 typical visit price
range $19.60 – $149.17
Typical copayment $26.64 (range $4.90 – $37.29)
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.

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.

DR. LEONARD ANANG SOWAH M.D.
Internal Medicine
22 S GREENE ST
BALTIMORE, MD 21201
Baltimore City (410) 706-4619
VISHAL BHATNAGAR MD
Student in an Organized Health Care Education/Training Program
22 S GREENE ST, MEDICINE, N3E09
BALTIMORE, MD 21201
Baltimore City (410) 328-6110
NANCE J FOX P.A.-C
Physician Assistant (Medical)
22 S GREENE ST, G2K36
BALTIMORE, MD 21201
Baltimore City (410) 328-1170
HILARY TAMARA WOLF MD
Pediatrics (Adolescent Medicine)
22 S GREENE ST
BALTIMORE, MD 21201
Baltimore City (410) 328-7373
MS. LINDSAY BREAM O'MEARA CRNP
Nurse Practitioner (Acute Care)
22 S GREENE ST, SUITE S4D07
BALTIMORE, MD 21201
Baltimore City (410) 328-3365
NORA T OLIVER M.D., M.P.H.
Student in an Organized Health Care Education/Training Program
22 S GREENE ST, N3E09
BALTIMORE, MD 21201
Baltimore City (410) 328-5756
SHOSHANA JO WEINER
Internal Medicine
22 S GREENE ST
BALTIMORE, MD 21201
Baltimore City (617) 214-1332
JENNA VANLIERE CANZONIERO M.D.
Internal Medicine
22 S GREENE ST, N3E09
BALTIMORE, MD 21201
Baltimore City (410) 328-5756

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 Ann Zimrin's NPI number?

The NPI number for Ann Zimrin is 1215991179. It was assigned to this individual provider in the NPPES registry on April 16, 2006.

Where is Ann Zimrin located?

Ann Zimrin practices at 22 S Greene St, Baltimore, MD 21201. The listed phone number is (419) 328-2594.

What is Ann Zimrin's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Hematology & Oncology, with taxonomy code 207RH0003X.

Is Ann Zimrin enrolled in Medicare?

Yes. Ann Zimrin 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 Ann Zimrin's services?

According to the CMS Revalidation Reassignment List (October 2026 release), Ann Zimrin reassigns Medicare benefits to University Of Maryland Oncology Associates, PA (Baltimore, MD). 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 Ann Zimrin's services. Reassignment records can lag staffing changes; confirm current arrangements with the organization.

Is Ann Zimrin affiliated with any hospitals?

According to CMS data, Ann Zimrin is affiliated with University Of Maryland Medical Center.

When was this NPI record last updated?

The NPPES record for Ann Zimrin was last updated on March 8, 2011. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 15 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.