OpenMedicare
Start Here
Explore
Fraud
Investigations
Data
Tools
About

Footer

OpenMedicare

Independent Medicare data journalism

Sister Sites

  • OpenMedicaid
  • OpenFeds
  • OpenSpending

Explore

  • Providers
  • Procedures
  • States
  • Specialties
  • Search

Fraud Analysis

  • Still Out There (AI)
  • Fraud Overview
  • Fraud Watchlist
  • Deep Dive Profiles
  • Impossible Numbers
  • Report Fraud

Investigations

  • The Algorithm Knows
  • How We Built the Model
  • Internal Medicine Crisis
  • Florida & California Fraud
  • Million Dollar Flagged
  • All Investigations

Tools

  • Provider Lookup
  • Compare
  • Cost Calculator
  • Your Medicare Dollar
  • Downloads

About

  • About OpenMedicare
  • Methodology
  • Glossary
  • Data Sources
  • API Docs
  • Updates
Data Sources: Centers for Medicare & Medicaid Services (CMS), Medicare Provider Utilization and Payment Data
Disclaimer: This site is an independent journalism project. Data analysis and editorial content are not affiliated with or endorsed by CMS or any government agency. All spending figures are based on publicly available Medicare payment records.
Sister Sites: OpenMedicaid ยท OpenFeds ยท OpenSpending

ยฉ 2026 OpenMedicare. Independent data journalism. Built by TheDataProject.ai

Methodologyโ€ขDownload Data
  1. Home
  2. Providers
  3. John Grimwood
๐Ÿ”ฌ
MDIndividual

John Grimwood, M.D.

NPI: 1184698391
Alpharetta, GA
8 years of data
Pathology
$4.3M
Total Payments
64.8K
Beneficiaries
65.5K
Services
1.76x
Markup Ratio

Peer Comparison

99th
percentile in specialty
This provider$4.3M
Specialty median$84.1K

๐Ÿ“‹ Key Findings

1Billed $4.3M over 8 years
21.76x markup ratio
399th percentile in Pathology by payments
4Payments surged 553% in 2017
58 procedures with >3x markup
โœ“ No flags detected

๐Ÿ”Ž Data Analysis

This provider's $4.3M in total Medicare payments ranks in the 99th percentile of Pathology providers nationally.

Medicare payments to this provider grew 6015% from 2016 to 2023.

AI-generated analysis based on Medicare payment data.

Annual Medicare Payments

Annual Services Provided

Avg Payment per Service

Markup Ratio Over Time

๐Ÿ“ˆ

Notable: Payments increased 553% in 2017

Year-over-year payment surges can indicate changes in practice volume, new services, or billing pattern shifts.

Submitted Charges vs. Medicare Payments

Average per-service amounts submitted by the provider compared to what Medicare actually paid โ€” the gap represents the markup.

YearAvg SubmittedAvg PaidMarkup RatioGap per ServiceTotal PaymentsServicesBeneficiaries
2016$266.43$60.044.44x$206.39$13.6K241237
2017$235.26$49.844.72x$185.42$88.9K1.6K1.5K
2018$199.12$60.133.31x$138.99$164.4K2.6K2.6K
2019$102.50$62.841.63x$39.66$1.0M16.6K16.4K
2020$103.32$64.451.60x$38.87$577.7K8.8K8.7K
2021$105.00$67.511.56x$37.49$806.4K11.6K11.5K
2022$105.15$65.641.60x$39.51$792.8K11.4K11.3K
2023$105.14$62.721.68x$42.42$832.8K12.6K12.5K

Top Procedures (14)

88312Special stained specimen slides to identify organisms including interpretation and report
$1.9M
22.2K services$84.48/svc1.34x markup
88305Pathology examination of tissue using a microscope, intermediate complexity
$1.6M
29.1K services$53.37/svc2.38x markup
88313Special stained specimen slides to examine tissue including interpretation and report
$626.4K
10.1K services$61.94/svc1.31x markup
88342Tissue or cell analysis by immunologic technique
$121.9K
1.5K services$82.60/svc2.01x markup
88341Special stained specimen slides to examine tissue
$86.4K
1.2K services$71.80/svc1.79x markup
88304Pathology examination of tissue using a microscope, moderately low complexity
$32.0K
1.0K services$30.90/svc2.63x markup
88323Surgical pathology consultation and reportโš  3.9x markup
$12.2K
117 services$103.89/svc3.85x markup
88307Pathology examination of tissue using a microscope, moderately high complexityโš  5.6x markup
$2.4K
34 services$71.60/svc5.59x markup
88321Surgical pathology consultation and reportโš  4.1x markup
$2.0K
25 services$79.64/svc4.08x markup
85060Blood smear interpretation by physician with written reportโš  4.1x markup
$1.8K
86 services$20.66/svc4.12x markup
88360Microscopic genetic analysis of tumorโš  3.2x markup
$1.4K
12 services$118.84/svc3.24x markup
88112Cell examination of specimenโš  11.2x markup
$1.0K
45 services$23.17/svc11.22x markup
88311Preparation of tissue for examination by removing any calcium presentโš  7.0x markup
$172.14
16 services$10.76/svc6.97x markup
88300Pathology examination of tissue using a microscope, limited examinationโš  17.3x markup
$111.00
32 services$3.47/svc17.30x markup
Show detailed table โ–พ
CodeDescriptionServicesPaymentsAvg/ServiceMarkup
88312Special stained specimen slides to identify organisms including interpretation and report22.2K$1.9M$84.481.34x
88305Pathology examination of tissue using a microscope, intermediate complexity29.1K$1.6M$53.372.38x
88313Special stained specimen slides to examine tissue including interpretation and report10.1K$626.4K$61.941.31x
88342Tissue or cell analysis by immunologic technique1.5K$121.9K$82.602.01x
88341Special stained specimen slides to examine tissue1.2K$86.4K$71.801.79x
88304Pathology examination of tissue using a microscope, moderately low complexity1.0K$32.0K$30.902.63x
88323Surgical pathology consultation and report117$12.2K$103.893.85x
88307Pathology examination of tissue using a microscope, moderately high complexity34$2.4K$71.605.59x
88321Surgical pathology consultation and report25$2.0K$79.644.08x
85060Blood smear interpretation by physician with written report86$1.8K$20.664.12x
88360Microscopic genetic analysis of tumor12$1.4K$118.843.24x
88112Cell examination of specimen45$1.0K$23.1711.22x
88311Preparation of tissue for examination by removing any calcium present16$172.14$10.766.97x
88300Pathology examination of tissue using a microscope, limited examination32$111.00$3.4717.30x

Markup Analysis

Charge-to-Payment Ratio

1.76x

This provider submits charges 1.76 times higher than what Medicare actually pays.

What This Means

A markup ratio of 1.76x means for every $100 Medicare pays, this provider initially charges $176. This is lower than the national average.

Location

Alpharetta, GA

Provider Verification

Always verify provider credentials and location before scheduling appointments. This data reflects Medicare payments and may not include all practice locations.

Similar Providers

Other Pathology providers in GA for peer comparison.

John Grimwood (you)
$4.3M
Scott Acker, MD
$50.6M
Show detailed table โ–พ
ProviderLocationTotal PaymentsStatus
Scott Acker, MDAlpharetta, GA$50.6Mโœ“ Clear

Related

Browse
โ† Back to Provider Directory
State
All providers in GA โ†’
Specialty
All Pathology providers โ†’
Tool
Compare this provider โ†’
Analysis
Fraud Watchlist โ†’
Search
Search all providers โ†’

Share This Provider

Share this provider's Medicare payment information

Share:

Data Sources

  • โ€ข Centers for Medicare & Medicaid Services (CMS)
  • โ€ข Medicare Provider Utilization and Payment Data (2014-2023)
  • โ€ข National Plan and Provider Enumeration System (NPPES)

Last Updated: February 2026 (data through 2023, the latest CMS release)

Note: All data is from publicly available Medicare records. OpenMedicare is an independent journalism project not affiliated with CMS.

Believe this data is inaccurate? Dispute this data