Recently Updated NPI Information — some details in this NPI profile have been updated in the NPI registry within the last 60 days.

GREGORY J STREFF DO
NPI 1558314005
Internal Medicine - Pulmonary Disease in Grand Blanc, MI

Q: What is Gregory Streff's NPI number?

The NPI number for Gregory Streff is 1558314005. It was assigned to this individual provider in the NPPES registry on May 18, 2006.

Q: What is Gregory Streff's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Pulmonary Disease, with taxonomy code 207RP1001X.

Q: When was this NPI record last updated?

The NPPES record for Gregory Streff was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 24 days 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 May 18, 2006PECOS Enrolled

56.42/100

CMS Quality Rating

9450 S SAGINAW RD, SUITE E, GRAND BLANC, MI 48439(810) 695-4000(810) 695-4055 Get Directions Write a Review

NPPES record last updated: July 13, 2026. Verified against the NPPES registry weekly; last sync: August 02, 2026.

On this page

About Gregory J Streff Do NPPES

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

GREGORY J STREFF DO (NPI 1558314005) is an individual pulmonary disease provider in Grand Blanc, Michigan, licensed in Michigan (5101008684) and active in the NPI registry since May 2006. He is enrolled in Medicare PECOS, is affiliated with Ascension Genesys Hospital, and is a graduate of Des Moines University Of Osteopathic Medicine And Health Sciences (1983).

NPPES Registry Identity

NPI1558314005

Entity TypeIndividualMale

Primary Taxonomy207RP1001X

Provider Legal NameGREGORY J STREFFCredential: DO

Location Address9450 S SAGINAW RD, SUITE EGrand Blanc, MI 48439-8206

Mailing Address9450 S Saginaw Rd, Suite EGrand Blanc, MI 48439-8206 · (810) 695-4000 · Fax (810) 695-4055

Phone(810) 695-4000

Fax(810) 695-4055

Sole ProprietorNo

Medical School CMSDes Moines University Of Osteopathic Medicine And Health SciencesGraduated 1983

Enumeration DateMay 18, 2006

Last NPPES UpdateJuly 13, 2026

✔ NPI 1558314005 is a valid, active identifier and passes the ISO check-digit test.

Specialties & Licenses

★ Primary SpecialtyInternal Medicine · Pulmonary DiseaseAllopathic & Osteopathic Physicians

Taxonomy Code207RP1001X

License✔ Licensed in MI · 5101008684

Definition

An internist who treats diseases of the lungs and airways. The pulmonologist diagnoses and treats cancer, pneumonia, pleurisy, asthma, occupational and environmental diseases, bronchitis, sleep disorders, emphysema and other complex disorders of the lungs.

9450 S SAGINAW RD, Grand Blanc, MI 48439

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Other Identifiers 4

OtherC4234MI · Mcare

Other0152500505MI · Healthplus

Other103MI · Community Choice

Medicaid3361051MI

Accepted Insurance

The full list of accepted plans is on the Insurance tab. Issuers include Ambetter from Buckeye Health Plan, Ambetter from Meridian, Ambetter Health and more.Insurance ›

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

Gregory J Streff Do 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 ID4284621913

PECOS Enrollment IDI20040426001827

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 12

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 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.

752 services403 patients

Test to examine how well the lungs exchange gases 94729

This is a test called a pulmonary function test, which helps understand the efficiency of your lungs. It measures how much air your lungs can hold, how quickly you can move air in and out of your lungs, and how well your lungs put oxygen into and remove carbon dioxide from your blood.

186 services183 patients

Test to measure expiratory airflow and volume changes before and after medication administration 94060

This procedure measures how air flows in and out of your lungs. It's done before and after medication to see if the treatment improves your breathing. It's a simple, non-invasive test that involves breathing into a device called a spirometer.

183 services180 patients

Test to determine lung volumes using sensors 94726

This test, called spirometry, measures lung capacity using sensors. You breathe into a mouthpiece attached to a device that records the amount and rate of air you inhale and exhale. It helps diagnose and monitor lung conditions.

141 services141 patients

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.

103 services87 patients

New patient office or other outpatient visit with a high level of medical decision making, if using time, 60 minutes or more 99205

This is a first-time patient visit where a healthcare professional spends 60-74 minutes with you. It involves a comprehensive evaluation, including your medical history and current health condition. They'll also advise on preventive health measures and formulate a treatment plan if needed.

67 services67 patients

Sleep study including heart rate, breathing, and sleep time 95800

A sleep study monitors your sleep patterns to evaluate your sleep quality. It records your heart rate, breathing, and actual sleep time. This information helps identify any sleep disorders, ensuring you get the rest you need for optimal health.

44 services44 patients

Test to determine lung volumes using gas dilution or washout 94727

This test measures lung volumes by either diluting or washing out a known amount of gas in your lungs. You'll breathe in a harmless gas, then exhale. The exhaled air is analyzed to assess your lung capacity and function.

43 services43 patients

Home sleep test (hst) with type iii portable monitor, unattended; minimum of 4 channels: 2 respiratory movement/airflow, 1 ecg/heart rate and 1 oxygen saturation G0399

A Home Sleep Test (HST) with a Type III Portable Monitor is an unattended test that records your breathing, heart rate, and oxygen levels during sleep. This test uses a minimum of 4 channels to monitor these parameters, helping to diagnose sleep disorders.

43 services43 patients

Established patient office or other outpatient visit with high level of medical decision making, if using time, 40 minutes or more 99215

This service involves a follow-up appointment for existing patients, lasting between 40 to 54 minutes. During this time, your healthcare provider will assess your current health status, discuss any changes or concerns, review your treatment plan, and answer any questions you may have.

34 services33 patients

Test for exercise-induced lung stress 94618

An exercise-induced lung stress test assesses how your lungs respond to physical activity. During the test, you'll exercise on a treadmill or stationary bike while your heart rate, breathing, blood pressure, and oxygen levels are monitored. This helps identify any abnormal lung responses to exercise.

27 services24 patients

Sleep study in sleep lab with continuous airway pressure (6 years or older) 95811

A sleep study in a sleep lab with continuous airway pressure is a test for individuals aged 6 and above. It monitors your sleep patterns to check for disorders like sleep apnea. Continuous airway pressure helps keep your airways open while you sleep, improving your breathing.

15 services15 patients

Hospital Affiliations CMS Care Compare

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

Ascension Genesys Hospital

Acute Care Hospitals · Grand Blanc, MI

3/5 CMS rating

OwnershipVoluntary non-profit - Church

CMS Certification Number230197

LocationOne Genesys ParkwayGrand Blanc, MI 48439 · Genesee County

Emergency services Birthing friendly

Physician Visit Costs CMS claims · ZIP area

Typical Medicare office-visit costs in the 48439 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

$126.15 typical visit price

range $54.34 – $166.68

Typical copayment $31.53 (range $13.58 – $41.67)

Most-billed visit code 99204

Established Patient

$96.44 typical visit price

range $17.09 – $135.40

Typical copayment $24.11 (range $4.27 – $33.85)

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.

56.42/100

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

Scored as part of a group practice

Quality

67.82

Promoting Interoperability

Improvement Activities

Cost

60.06

Referred Medical Equipment & Supplies CMS DME claims 33

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

Supplies for maintenance of non-insulin drug infusion catheter, per week (list drugs separately) A4221

DME-Other DME · category DE017N

2 suppliers38 claims160 services$17.45 avg. paid by Medicare

Tubing with integrated heating element for use with positive airway pressure device A4604

DME-Other DME · category DE001N

26 suppliers289 claims291 services$32.88 avg. paid by Medicare

Administration set, with small volume nonfiltered pneumatic nebulizer, disposable A7003

DME-Other DME · category DE000N

3 suppliers16 claims30 services$1.33 avg. paid by Medicare

Full face mask used with positive airway pressure device, each A7030

DME-Other DME · category DE001N

21 suppliers342 claims344 services$73.45 avg. paid by Medicare

Face mask interface, replacement for full face mask, each A7031

DME-Other DME · category DE001N

20 suppliers331 claims786 services$27.97 avg. paid by Medicare

Cushion for use on nasal mask interface, replacement only, each A7032

DME-Other DME · category DE001N

17 suppliers133 claims670 services$14.84 avg. paid by Medicare

Pillow for use on nasal cannula type interface, replacement only, pair A7033

DME-Other DME · category DE001N

18 suppliers130 claims631 services$13.27 avg. paid by Medicare

Nasal interface (mask or cannula type) used with positive airway pressure device, with or without head strap A7034

DME-Other DME · category DE001N

24 suppliers271 claims271 services$45.68 avg. paid by Medicare

Headgear used with positive airway pressure device A7035

DME-Other DME · category DE001N

25 suppliers361 claims361 services$15.77 avg. paid by Medicare

Chinstrap used with positive airway pressure device A7036

DME-Other DME · category DE001N

8 suppliers25 claims25 services$9.79 avg. paid by Medicare

Tubing used with positive airway pressure device A7037

DME-Other DME · category DE001N

16 suppliers261 claims265 services$10.41 avg. paid by Medicare

Filter, disposable, used with positive airway pressure device A7038

DME-Other DME · category DE001N

28 suppliers587 claims2,960 services$1.76 avg. paid by Medicare

Water chamber for humidifier, used with positive airway pressure device, replacement, each A7046

DME-Other DME · category DE001N

25 suppliers265 claims265 services$12.51 avg. paid by Medicare

Portable gaseous oxygen system, rental; includes portable container, regulator, flowmeter, humidifier, cannula or mask, and tubing E0431

DME-Oxygen and Supplies · category DC000N

8 suppliers174 claims181 services$14.98 avg. paid by Medicare

Portable oxygen contents, gaseous, 1 month's supply = 1 unit E0443

DME-Oxygen and Supplies · category DC000N

5 suppliers41 claims44 services$39.96 avg. paid by Medicare

Respiratory assist device, bi-level pressure capability, without backup rate feature, used with noninvasive interface, e.g., nasal or facial mask (intermittent assist device with continuous positive airway pressure device) E0470

DME-Other DME · category DE001N

10 suppliers177 claims191 services$66.70 avg. paid by Medicare

Respiratory assist device, bi-level pressure capability, with back-up rate feature, used with noninvasive interface, e.g., nasal or facial mask (intermittent assist device with continuous positive airway pressure device) E0471

DME-Other DME · category DE001N

3 suppliers41 claims44 services$185.15 avg. paid by Medicare

Humidifier, heated, used with positive airway pressure device E0562

DME-Other DME · category DE001N

8 suppliers20 claims20 services$124.06 avg. paid by Medicare

Humidifier, heated, used with positive airway pressure device E0562

DME-Other DME · category DE001N

10 suppliers423 claims455 services$10.73 avg. paid by Medicare

Nebulizer, with compressor E0570

DME-Other DME · category DE000N

4 suppliers46 claims46 services$3.10 avg. paid by Medicare

Continuous positive airway pressure (cpap) device E0601

DME-Other DME · category DE001N

14 suppliers557 claims572 services$26.64 avg. paid by Medicare

Oxygen concentrator, single delivery port, capable of delivering 85 percent or greater oxygen concentration at the prescribed flow rate E1390

DME-Oxygen and Supplies · category DC002N

14 suppliers473 claims476 services$62.58 avg. paid by Medicare

Portable oxygen concentrator, rental E1392

DME-Oxygen and Supplies · category DC002N

9 suppliers148 claims148 services$29.92 avg. paid by Medicare

Injection, immune globulin (cuvitru), 100 mg J1555

Treatment-Injections and Infusions (nononcologic) · category RI008N

1 supplier12 claims3,840 services$11.68 avg. paid by Medicare

Injection, immune globulin (hizentra), 100 mg J1559

Treatment-Injections and Infusions (nononcologic) · category RI008N

1 supplier26 claims11,440 services$9.49 avg. paid by Medicare

Albuterol, inhalation solution, fda-approved final product, non-compounded, administered through dme, unit dose, 1 mg J7613

DME-Drugs Administered Through DME · category DG006N

10 suppliers41 claims18,101 services$0.03 avg. paid by Medicare

Albuterol, up to 2.5 mg and ipratropium bromide, up to 0.5 mg, fda-approved final product, non-compounded, administered through dme J7620

DME-Drugs Administered Through DME · category DG006N

4 suppliers19 claims2,550 services$0.07 avg. paid by Medicare

Budesonide, inhalation solution, fda-approved final product, non-compounded, administered through dme, unit dose form, up to 0.5 mg J7626

DME-Drugs Administered Through DME · category DG000N

4 suppliers14 claims960 services$0.81 avg. paid by Medicare

Ipratropium bromide, inhalation solution, fda-approved final product, non-compounded, administered through dme, unit dose form, per milligram J7644

DME-Drugs Administered Through DME · category DG006N

3 suppliers20 claims1,470 services$0.14 avg. paid by Medicare

Supplies for external non-insulin drug infusion pump, syringe type cartridge, sterile, each K0552

DME-Other DME · category DE000N

2 suppliers38 claims256 services$2.29 avg. paid by Medicare

Portable gaseous oxygen system, rental; home compressor used to fill portable oxygen cylinders; includes portable containers, regulator, flowmeter, humidifier, cannula or mask, and tubing K0738

DME-Oxygen and Supplies · category DC000N

2 suppliers14 claims14 services$29.91 avg. paid by Medicare

Pharmacy dispensing fee for inhalation drug(s); per 30 days Q0513

DME-Other DME · category DE000N

7 suppliers48 claims48 services$23.02 avg. paid by Medicare

Pharmacy dispensing fee for inhalation drug(s); per 90 days Q0514

DME-Other DME · category DE000N

6 suppliers17 claims17 services$49.13 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 6

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

PAULA M WHALEN NP

Nurse Practitioner (Acute Care)

9450 S SAGINAW RD, SUITE E
GRAND BLANC, MI 48439

Genesee County (810) 695-4000

CARDIOVASCULAR CARE ASSOCIATES PLC

Internal Medicine (Cardiovascular Disease)

9450 S SAGINAW RD
GRAND BLANC, MI 48439

Genesee County (810) 875-9186

PULMONARY MEDICINE AND SLEEP SPECIALISTS PC

Internal Medicine (Pulmonary Disease)

9450 S SAGINAW RD, SUITE E
GRAND BLANC, MI 48439

Genesee County (810) 695-4000

HEMANT T THAWANI MD PLLC

Internal Medicine (Endocrinology, Diabetes & Metabolism)

9450 S SAGINAW RD, SUITE G
GRAND BLANC, MI 48439

Genesee County (810) 603-9391

HEMANT T THAWANI MD

Internal Medicine (Endocrinology, Diabetes & Metabolism)

9450 S SAGINAW RD, SUITE G
GRAND BLANC, MI 48439

Genesee County (810) 603-9391

CAROL ANN SCAMEHORN PA

Physician Assistant

9450 S SAGINAW RD, SUITE G
GRAND BLANC, MI 48439

Genesee County (810) 603-9391

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 Gregory Streff's NPI number?

The NPI number for Gregory Streff is 1558314005. It was assigned to this individual provider in the NPPES registry on May 18, 2006.

Where is Gregory Streff located?

Gregory Streff practices at 9450 S Saginaw Rd Suite E, Grand Blanc, MI 48439. The listed phone number is (810) 695-4000.

What is Gregory Streff's specialty?

The primary specialty registered for this NPI is Internal Medicine, specializing in Pulmonary Disease, with taxonomy code 207RP1001X.

Is Gregory Streff enrolled in Medicare?

Yes. Gregory Streff 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.

What insurance does Gregory Streff accept?

Health plans from Ambetter Health, Ambetter from Buckeye Health Plan, Ambetter from Meridian, Blue Care Network of Michigan and Blue Cross Blue Shield of Michigan Mutual Insurance Company and 2 other insurers list Gregory Streff as in-network in at least one marketplace plan. Coverage varies by plan and year; verify with the insurer or the provider before a visit.

Is Gregory Streff affiliated with any hospitals?

According to CMS data, Gregory Streff is affiliated with Ascension Genesys Hospital.

When was this NPI record last updated?

The NPPES record for Gregory Streff was last updated on July 13, 2026. NPI Profile syncs weekly with the NPPES registry data releases published by CMS. This NPI record was last updated 24 days 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.