diff --git a/transparency-in-coverage/python/mrfutils/src/mrfutils/flatteners.py b/transparency-in-coverage/python/mrfutils/src/mrfutils/flatteners.py
index de5f43e..53edf40 100644
--- a/transparency-in-coverage/python/mrfutils/src/mrfutils/flatteners.py
+++ b/transparency-in-coverage/python/mrfutils/src/mrfutils/flatteners.py
@@ -639,8 +639,8 @@ def swap_references(
 			yield item
 
 
-def start_parser(filename) -> Generator:
-	with JSONOpen(filename) as f:
+def start_parser(filename, zip_file=None) -> Generator:
+	with JSONOpen(filename, zip_file) as f:
 		yield from ijson.parse(f, use_float = True)
 
 
@@ -648,6 +648,7 @@ def in_network_file_to_csv(
 	url: str,
 	out_dir: str,
 	file:        str | None = None,
+	zip_file:    str | None = None,
 	code_filter: set | None = None,
 	npi_filter:  set | None = None,
 ) -> None:
@@ -673,7 +674,7 @@ def in_network_file_to_csv(
 	ref_map = None
 
 	metadata = ijson.ObjectBuilder()
-	parser = start_parser(file)
+	parser = start_parser(file, zip_file)
 
 	file_row = file_row_from_url(url)
 	file_row['url'] = url
@@ -695,7 +696,7 @@ def in_network_file_to_csv(
 		except StopIteration:
 			if completed: break
 			if ref_map is None: ref_map = {}
-			parser = start_parser(file)
+			parser = start_parser(file, zip_file)
 			ffwd(parser, to_prefix='', to_value='in_network')
 			prefix, event, value = ('', 'map_key', 'in_network')
 			prepend(('', 'map_key', 'in_network'), parser)
diff --git a/transparency-in-coverage/python/mrfutils/src/mrfutils/helpers.py b/transparency-in-coverage/python/mrfutils/src/mrfutils/helpers.py
index fb236d3..78ec059 100644
--- a/transparency-in-coverage/python/mrfutils/src/mrfutils/helpers.py
+++ b/transparency-in-coverage/python/mrfutils/src/mrfutils/helpers.py
@@ -1,19 +1,20 @@
 import csv
 import gzip
 import hashlib
+import io
 import json
 import logging
 import os
+import zipfile
 from itertools import chain
 from pathlib import Path
 from urllib.parse import urlparse
 
 import requests
-
 from mrfutils.exceptions import InvalidMRF
 
-log = logging.getLogger('mrfutils')
-log.setLevel(logging.INFO)
+log = logging.getLogger('flatteners')
+# log.setLevel(logging.DEBUG)
 
 
 def prepend(value, iterator):
@@ -37,7 +38,7 @@ def peek(iterator):
 
 class JSONOpen:
 	"""
-	Context manager for opening JSON(.gz) MRFs.
+	Context manager for opening JSON(.gz/.zip) MRFs.
 	Usage:
 	>>> with JSONOpen('localfile.json') as f:
 	or
@@ -45,57 +46,72 @@ class JSONOpen:
 	including both zipped and unzipped files.
 	"""
 
-	def __init__(self, filename):
+	def __init__(self, filename, zip_file=None):
 		self.filename = filename
+		self.zip_file = zip_file
 		self.f = None
 		self.r = None
 		self.is_remote = None
 
-		parsed_url = urlparse(self.filename)
-		self.suffix = ''.join(Path(parsed_url.path).suffixes)
-		if not self.suffix:
-			self.suffix = ''.join(Path(parsed_url.query).suffixes)
+		if not self.zip_file:
+			parsed_url = urlparse(self.filename)
+			self.suffix = ''.join(Path(parsed_url.path).suffixes)
+			if not self.suffix:
+				self.suffix = ''.join(Path(parsed_url.query).suffixes)
 
-		if not (
-			self.suffix.endswith('.json.gz') or
-			self.suffix.endswith('.json')
-		):
-			raise InvalidMRF(f'Suffix not JSON: {self.filename=} {self.suffix=}')
+			if not (
+				self.suffix.endswith('.json.gz') or
+				self.suffix.endswith('.json') or
+				self.suffix.endswith('.zip')
+			):
+				raise InvalidMRF(f'Suffix not JSON or ZIP: {self.filename=} {self.suffix=}')
 
-		self.is_remote = parsed_url.scheme in ('http', 'https')
+			self.is_remote = parsed_url.scheme in ('http', 'https')
+		else:
+			self.suffix = ".zip"
+			self.is_remote = False
 
 	def __enter__(self):
-		if (
-			self.is_remote
-			# endswith is used to protect against the case
-			# where the filename contains lots of dots
-			# insurer.stuff.json.gz
-			and self.suffix.endswith('.json.gz')
-		):
-			self.s = requests.Session()
-			self.r = self.s.get(self.filename, stream=True)
-			self.f = gzip.GzipFile(fileobj=self.r.raw)
-
-		elif (
-			self.is_remote
-			and self.suffix.endswith('.json')
-		):
-			self.s = requests.Session()
-			self.r = self.s.get(self.filename, stream=True)
-			self.r.raw.decode_content = True
-			self.f = self.r.raw
-
-		elif self.suffix == '.json.gz':
-			self.f = gzip.open(self.filename, 'rb')
-
+		if self.suffix.endswith('.zip'):
+			if self.is_remote:
+				# Download the zip file and store it in memory
+				response = requests.get(self.filename)
+				response.raise_for_status()
+				zip_data = io.BytesIO(response.content)
+
+				# Open the first file in the zip
+				with zipfile.ZipFile(zip_data) as zip_file:
+					inner_filename = zip_file.namelist()[0]
+					self.f = zip_file.open(inner_filename)
+			else:
+				with zipfile.ZipFile(self.zip_file) as z:
+					self.f = z.open(self.filename)
+
+		elif self.suffix.endswith('.json.gz'):
+			if self.is_remote:
+				self.s = requests.Session()
+				self.r = self.s.get(self.filename, stream=True)
+				self.f = gzip.GzipFile(fileobj=self.r.raw)
+			else:
+				self.f = gzip.open(self.filename, 'rb')
+		elif self.suffix.endswith('.json'):
+			if self.is_remote:
+				self.s = requests.Session()
+				self.r = self.s.get(self.filename, stream=True)
+				self.r.raw.decode_content = True
+				self.f = self.r.raw
+			else:
+				self.f = open(self.filename, 'rb')
 		else:
-			self.f = open(self.filename, 'rb')
+			raise InvalidMRF(f'Suffix not JSON or ZIP: {self.filename=} {self.suffix=}')
 
 		log.info(f'Opened file: {self.filename}')
 		return self.f
 
+
 	def __exit__(self, exc_type, exc_val, exc_tb):
-		if self.is_remote:
+		# ZIP files do not use sessions and are thus not closable
+		if self.is_remote and not self.suffix.endswith('.zip'):
 			self.s.close()
 			self.r.close()